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Xia L, Yin R, Mao L, Shi X. Prevalence and impact of frailty in patients undergoing colorectal cancer surgery: A systematic review and meta-analysis based on modified frailty index. J Surg Oncol 2024. [PMID: 39016206 DOI: 10.1002/jso.27778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2024] [Accepted: 07/01/2024] [Indexed: 07/18/2024]
Abstract
Frailty has been linked to unfavorable postoperative outcomes in patients with colorectal cancer (CRC). However, the prevalence of frailty among CRC surgery patients and its association with mortality and postoperative complications, as evaluated by the modified frailty index (mFI), have not been thoroughly investigated and necessitate clarification. PubMed, Web of Science, Embase, and CBM databases were systematically searched for relevant studies (up to January 2024), and the pooled prevalence and odds ratio (OR) estimate were calculated. A total of 16 studies containing 245 747 patients undergoing CRC surgery were included. The prevalence of frailty among CRC surgery patients was 31% (95% confidence interval [CI] = 20%-42%; I2 = 100%, p < 0.001). In patients undergoing CRC surgery, frailty was associated with a higher incidence of postoperative complications (OR = 1.94; 95% CI = 1.47-2.56; I2 = 91.9%, p < 0.001), but it did not exhibit any significant correlation with the 30-day mortality (OR = 5.17; 95% CI = 0.39-68.64; I2 = 94.4%, p < 0.001). Frailty is common in CRC surgery and exerts a significant negative impact on the postoperative outcomes. Future research could explore the potential of the mFI to facilitate a more streamlined and precise quantification of frailty, thereby establishing a refined understanding of its correlation with surgery prognosis.
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Affiliation(s)
- Liwen Xia
- Department of Nursing, The First Affiliated Hospital of Soochow University, Suzhou, China
- School of Nursing, Medical College of Soochow University, Suzhou, China
| | - Rulan Yin
- Department of Nursing, The First Affiliated Hospital of Soochow University, Suzhou, China
- Faculty of Nursing, Chiang Mai University, Chiang Mai, Thailand
| | - Lifen Mao
- Department of Nursing, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xiaoqing Shi
- Department of Nursing, The First Affiliated Hospital of Soochow University, Suzhou, China
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Jin Y, Tang S, Wang W, Zhang W, Hou Y, Jiao Y, Hou B, Ma Z. Preoperative frailty predicts postoperative pain after total knee arthroplasty in older patients: a prospective observational study. Eur Geriatr Med 2024; 15:657-665. [PMID: 38349508 DOI: 10.1007/s41999-024-00932-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 01/04/2024] [Indexed: 08/17/2024]
Abstract
PURPOSE Frailty is reportedly associated with postoperative adverse outcomes and may increase the risk of post-surgical pain. Our study aimed to explore whether frailty was an independent risk factor for pain after total knee arthroplasty (TKA) in older patients. METHODS Included in this prospective observational study were patients aged 65 or older who underwent primary TKA. Frailty of the patients was assessed before surgery using the comprehensive geriatric assessment-frailty index and pain was evaluated before and after surgery using the Numerical Rating Scale. RESULTS Of the 164 patients including 125 females with a mean age of 71.4 ± 4.6 years, 51 patients were identified as being frail. Patients with chronic post-surgical pain had a significantly higher frailty index than those without chronic post-surgical pain, which was the same in patients with acute post-surgical pain. After adjusting for other confounding factors, frailty was shown to be an independent risk factor for both acute (OR: 13.23, 95% CI 3.73-46.93, P < 0.001) and chronic post-surgical pain (OR: 4.24, 95% CI 1.29-14.00, P = 0.02). The area under the receiver operating characteristic curve for frailty predicting chronic post-surgical pain was 0.73 (P < 0.001, 95% CI 0.65-0.81). CONCLUSIONS Our findings demonstrated that preoperative frailty in older patients was a predictor of acute and chronic post-surgical pain after TKA, suggesting that frailty assessment should become a necessary procedure before operations, especially in older patients.
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Affiliation(s)
- Yinan Jin
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China
| | - Suhong Tang
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China
| | - Wenwen Wang
- Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Wei Zhang
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China
| | - Yunfan Hou
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China
| | - Yang Jiao
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China.
| | - Bailing Hou
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China.
| | - Zhengliang Ma
- Department of Anesthesiology, Affiliated Drum Tower Hospital, Medical School, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, China.
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Jiang W, Yu H, Yujun Liu, Xun F, Ma Z, Yang J, Wang A, Wang H. Evaluation and Application of Frailty Index in Colorectal Cancer: A Comprehensive Review. Am Surg 2024; 90:1630-1637. [PMID: 38214220 DOI: 10.1177/00031348241227191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Colorectal cancer (CRC) is a common malignant tumor that primarily affects the elderly population. Surgery is one of the main treatment modalities for CRC. Frailty is a prevalent characteristic among the elderly and a leading cause of mortality. The frailty index (FI) is a comprehensive tool for assessing patients' frailty status, quantifying indicators such as weight loss, fatigue, and nutritional status, to reflect the degree of frailty. In recent years, the FI has undergone modifications to more accurately evaluate the risk of surgical complications and prognosis in CRC patients. This review summarizes the methods for frailty assessment, the development and modifications of the FI, and compiles the research findings and applications of the FI in predicting surgical complications, postoperative recovery, and survival rates in CRC patients. Furthermore, limitations in the current modified frailty index (mFI) and future research directions are discussed. This review provides essential references for further understanding the role of frailty in CRC patients and the clinical application of the mFI.
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Affiliation(s)
- Wenliang Jiang
- Taizhou People's Hospital, Postgraduate Training Base of Dalian Medical University, Taizhou, China
| | - Huan Yu
- Taizhou People's Hospital, Postgraduate Training Base of Dalian Medical University, Taizhou, China
| | - Yujun Liu
- Department of General Surgery, The Affiliated Taizhou People's Hospital of Nanjing Medical University, Taizhou School of Clinical Medicine, Nanjing Medical University, Taizhou, China
| | - Feng Xun
- Taizhou People's Hospital, Postgraduate Training Base of Dalian Medical University, Taizhou, China
| | - Zhengkang Ma
- Taizhou People's Hospital, Postgraduate Training Base of Dalian Medical University, Taizhou, China
| | - Jiacheng Yang
- Taizhou People's Hospital, Postgraduate Training Base of Dalian Medical University, Taizhou, China
| | - Aimei Wang
- Department of General Surgery, The Affiliated Taizhou People's Hospital of Nanjing Medical University, Taizhou School of Clinical Medicine, Nanjing Medical University, Taizhou, China
| | - Honggang Wang
- Department of General Surgery, The Affiliated Taizhou People's Hospital of Nanjing Medical University, Taizhou School of Clinical Medicine, Nanjing Medical University, Taizhou, China
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Kwok VKY, Reid N, Hubbard RE, Thavarajah H, Gordon EH. Multicomponent perioperative interventions to improve outcomes for frail patients: a systematic review. BMC Geriatr 2024; 24:376. [PMID: 38671345 PMCID: PMC11055226 DOI: 10.1186/s12877-024-04985-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 04/17/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND Preoperative frailty is associated with increased risk of adverse outcomes. In 2017, McIsaac and colleagues' systematic review found that few interventions improved outcomes in this population and evidence was low-quality. We aimed to systematically review the evidence for multicomponent perioperative interventions in frail patients that has emerged since McIsaac et al.'s review. METHODS PUBMED, EMBASE, Cochrane, and CINAHL databases were searched for English-language studies published since January 1, 2016, that evaluated multicomponent perioperative interventions in patients identified as frail. Quality was assessed using the National Institute of Health Quality Assessment Tool. A narrative synthesis of the extracted data was conducted. RESULTS Of 2835 articles screened, five studies were included, all of which were conducted in elective oncologic gastrointestinal surgical populations. Four hundred and thirteen patients were included across the five studies and the mean/median age ranged from 70.1 to 87.0 years. Multicomponent interventions were all applied in the preoperative period. Two studies also applied interventions postoperatively. All interventions addressed exercise and nutritional domains with variability in timing, delivery, and adherence. Multicomponent interventions were associated with reduced postoperative complications, functional deterioration, length of stay, and mortality. Four studies reported on patient-centred outcomes. The quality of evidence was fair. CONCLUSIONS This systematic review provides evidence that frail surgical patients undergoing elective oncologic gastrointestinal surgery may benefit from targeted multicomponent perioperative interventions. Yet methodological issues and substantial heterogeneity of the interventions precludes drawing clear conclusions regarding the optimal model of care. Larger, low risk of bias studies are needed to evaluate optimal intervention delivery, effectiveness in other populations, implementation in health care settings and ascertain outcomes of importance for frail patients and their carers.
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Affiliation(s)
- Vivian Ka-Yan Kwok
- Princess Alexandra Hospital, Metro South Hospital and Health Service, Brisbane, QLD, Australia.
- Centre for Health Services Research, The University of Queensland, Brisbane, Australia.
| | - Natasha Reid
- Centre for Health Services Research, The University of Queensland, Brisbane, Australia
| | - Ruth E Hubbard
- Princess Alexandra Hospital, Metro South Hospital and Health Service, Brisbane, QLD, Australia
- Centre for Health Services Research, The University of Queensland, Brisbane, Australia
| | | | - Emily H Gordon
- Princess Alexandra Hospital, Metro South Hospital and Health Service, Brisbane, QLD, Australia
- Centre for Health Services Research, The University of Queensland, Brisbane, Australia
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Ding L, Hua Q, Xu J, Yang J, Yao C. Predictive performance of different measures of frailty (CFS, mFI-11, mFI-5) on postoperative adverse outcomes among colorectal cancer patients: a diagnostic meta-analysis. Eur Geriatr Med 2024; 15:471-479. [PMID: 38488983 DOI: 10.1007/s41999-024-00960-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 12/07/2023] [Indexed: 03/17/2024]
Abstract
PURPOSE To clarify the predictive performance of different measures of frailty, including Clinical Frailty Scale (CFS), 11-factor modified Frailty Index (mFI-11), and 5-factor modified Frailty Index (mFI-5), on adverse outcomes. METHODS PubMed, Embase, Web of Science, and other databases were retrieved from the inception of each database to June 2023. The pooled sensitivity, specificity, and the area under the summary receiver operating curve (SROC) values were analyzed to determine the predictive power of CFS, mFI-11, and mFI-5 for adverse outcomes. RESULTS A total of 25 studies were included in quantitative synthesis. The pooled sensitivity values of CFS for predicting anastomotic leakage, total complications, and major complications were 0.39, 0.57, 0.45; pooled specificity values were 0.70, 0.58, 0.73; the area under SROC values were 0.58, 0.6, 0.66. The pooled sensitivity values of mFI-11 for predicting total complications and delirium were 0.38 and 0.64; pooled specificity values were 0.83 and 0.72; the area under SROC values were 0.64 and 0.74. The pooled sensitivity values of mFI-5 for predicting total complications, 30-day mortality, and major complications were 0.27, 0.54, 0.25; pooled specificity values were 0.82, 0.84, 0.81; the area under SROC values were 0.63, 0.82, 0.5. CONCLUSION The results showed that CFS could predict anastomotic leakage, total complications, and major complications; mFI-11 could predict total complications and delirium; mFI-5 could predict total complications and 30-day mortality. More high-quality research is needed to support the conclusions of this study further.
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Affiliation(s)
- Lingyu Ding
- Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Qianwen Hua
- Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Jiaojiao Xu
- Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Jing Yang
- Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Cui Yao
- Department of Colorectal Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China.
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Skořepa P, Ford KL, Alsuwaylihi A, O'Connor D, Prado CM, Gomez D, Lobo DN. The impact of prehabilitation on outcomes in frail and high-risk patients undergoing major abdominal surgery: A systematic review and meta-analysis. Clin Nutr 2024; 43:629-648. [PMID: 38306891 DOI: 10.1016/j.clnu.2024.01.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 01/11/2024] [Accepted: 01/15/2024] [Indexed: 02/04/2024]
Abstract
BACKGROUND & AIMS Prehabilitation comprises multidisciplinary preoperative interventions including exercise, nutritional optimisation and psychological preparation aimed at improving surgical outcomes. The aim of this systematic review and meta-analysis was to determine the impact of prehabilitation on postoperative outcomes in frail and high-risk patients undergoing major abdominal surgery. METHODS Embase, Medline, CINAHAL and Cochrane databases were searched from January 2010 to January 2023 for randomised clinical trials (RCTs) and observational studies evaluating unimodal (exercise) or multimodal prehabilitation programmes. Meta-analysis was limited to length of stay (primary end point), severe postoperative complications (Clavien-Dindo Classification ≥ Grade 3) and the 6-minute walk test (6MWT). The analysis was performed using RevMan v5.4 software. RESULTS Sixteen studies (6 RCTs, 10 observational) reporting on 3339 patients (1468 prehabilitation group, 1871 control group) were included. The median (interquartile range) age was 74.0 (71.0-78.4) years. Multimodal prehabilitation was applied in fifteen studies and unimodal in one. Meta-analysis of nine studies showed a reduction in hospital length of stay (weighted mean difference -1.07 days, 95 % CI -1.60 to -0.53 days, P < 0.0001, I2 = 19 %). Ten studies addressed severe complications and a meta-analysis suggested a decline in occurrence by up to 44 % (odds ratio 0.56, 95 % CI 0.37 to 0.82, P < 0.004, I2 = 51 %). Four studies provided data on preoperative 6MWT. The pooled weighted mean difference was 40.1 m (95 % CI 32.7 to 47.6 m, P < 0.00001, I2 = 24 %), favouring prehabilitation. CONCLUSION Given the significant impact on shortening length of stay and reducing severe complications, prehabilitation should be encouraged in frail, older and high-risk adult patients undergoing major abdominal surgery.
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Affiliation(s)
- Pavel Skořepa
- Nottingham Digestive Diseases Centre, Division of Translational Medical Sciences, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK; National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals and University of Nottingham, Queen's Medical Centre, Nottingham, UK; Department of Military Internal Medicine and Military Hygiene, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czech Republic; 3rd Department of Internal Medicine-Metabolic Care and Gerontology, University Hospital and Faculty of Medicine in Hradec Králové, Charles University in Prague, Hradec Králové, Czech Republic. https://twitter.com/PavelSkorepa
| | - Katherine L Ford
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Canada; Department of Kinesiology & Health Sciences, University of Waterloo, Waterloo, Canada. https://twitter.com/KathFord_RD
| | - Abdulaziz Alsuwaylihi
- Nottingham Digestive Diseases Centre, Division of Translational Medical Sciences, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK; National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals and University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Dominic O'Connor
- School of Health Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, UK. https://twitter.com/Dom_OConnor1
| | - Carla M Prado
- Department of Agricultural, Food & Nutritional Science, University of Alberta, Edmonton, Canada. https://twitter.com/DrCarlaPrado
| | - Dhanny Gomez
- Nottingham Digestive Diseases Centre, Division of Translational Medical Sciences, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Dileep N Lobo
- Nottingham Digestive Diseases Centre, Division of Translational Medical Sciences, School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, UK; National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals and University of Nottingham, Queen's Medical Centre, Nottingham, UK; MRC Versus Arthritis Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, UK; Division of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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McGovern J, Dolan RD, Horgan PG, Laird BJ, McMillan DC. The prevalence and prognostic value of frailty screening measures in patients undergoing surgery for colorectal cancer: observations from a systematic review. BMC Geriatr 2022; 22:260. [PMID: 35351011 PMCID: PMC8962494 DOI: 10.1186/s12877-022-02928-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Accepted: 03/11/2022] [Indexed: 02/08/2023] Open
Abstract
Introduction Frailty is a complex multifactorial syndrome characterised by a significant increase in vulnerability and worsened health outcomes. Despite a range of proposed frailty screening measures, the prevalence and prognostic value of frailty in patients undergoing surgery for colorectal cancer is not clear. Aim The aim of this present review was to examine the use of commonly employed frailty screening measures in patients undergoing surgery for colorectal cancer. Methods A systematic search of PubMed and Medline was carried out to identify studies reporting the use of frailty screening tools or measures in patients undergoing surgery for colorectal cancer. The screening measure used and prevalence of frailty within the population were recorded. Outcomes of interest were the incidence of post-operative complications, 30-day mortality and overall survival. Results Of the 15 studies included (n = 97, 898 patients), 9 studies were retrospective and included patients aged 70 years or older (n = 96, 120 patients). 5 of 12 studies reported that frailty was independently associated with the incidence of post-operative complications. There was also evidence that frailty was independently associated with 30-day mortality (1 of 4 studies, n = 9, 252 patients) and long-term survival (2 of 3 studies, n = 1, 420 patients). Conclusions Frailty was common in patients with colorectal cancer and the assessment of frailty may have prognostic value in patients undergoing surgery. However, the basis of the relationship between frailty and post-operative outcomes is not clear and merits further study.
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Affiliation(s)
- Josh McGovern
- Academic Unit of Surgery, School of Medicine, University of Glasgow, New Lister Building, Royal Infirmary, Glasgow, G31 2ER, UK.
| | - Ross D Dolan
- Academic Unit of Surgery, School of Medicine, University of Glasgow, New Lister Building, Royal Infirmary, Glasgow, G31 2ER, UK
| | - Paul G Horgan
- Academic Unit of Surgery, School of Medicine, University of Glasgow, New Lister Building, Royal Infirmary, Glasgow, G31 2ER, UK
| | - Barry J Laird
- Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, EH4 2XU, UK
| | - Donald C McMillan
- Academic Unit of Surgery, School of Medicine, University of Glasgow, New Lister Building, Royal Infirmary, Glasgow, G31 2ER, UK
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Chan DKH, Leong SW, Keh CHL. Perioperative and oncologic outcomes in young and octogenarian patients with colorectal cancer: a comparison at the extremes. Langenbecks Arch Surg 2021; 406:2399-2408. [PMID: 34312720 DOI: 10.1007/s00423-021-02275-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 07/13/2021] [Indexed: 01/22/2023]
Abstract
INTRODUCTION In colorectal cancer (CRC), surgical outcomes in the young (< 50) and octogenarian populations are believed to be poor due to an aggressive phenotype in the former, and increased frailty in the latter. Given that age-related effects are inversely related between groups, we compared short- and long-term outcomes of young and octogenarian patients with CRC to determine the dominance of one age-related factor over another. METHODS A prospectively collected database from 2015 to 2020 of all CRC was analyzed. Cases were divided into metastatic and non-metastatic groups. RESULTS Among non-metastatic cases, there were 34 young and 113 octogenarian patients. Mean CEA was higher among octogenarians (11.2 vs 32.8 units/ml; p = 0.041). Octogenarians suffered from more comorbidities than younger counterparts, with increased rates of postoperative UTI (3.3% vs 10.3%; p = 0.246) and pneumonia (3.1% vs 8.8%; p = 0.331). There was no increased rate of reintervention or Clavien-Dindo scores. We noticed a statistically significant higher proportion of extramural vascular invasion (EMVI) (8.8% vs 32.3%; p = 0.003) among the young. When excluding octogenarians who had declined surgery, Kaplan-Meier analysis showed no difference in disease-free (p = 0.290) or overall survival (p = 0.111). Among metastatic cases, there were 21 young and 19 octogenarian patients. Young patients were treated more aggressively with chemotherapy (55.6% vs 12.5%; p = 0.040). There was however no difference in overall survival between groups (p = 0.610). CONCLUSIONS Octogenarians may have more comorbidities, but can achieve similar surgical outcomes with younger patients. There is no reason to suspect a more aggressive phenotype in younger patients.
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Affiliation(s)
- Dedrick Kok Hong Chan
- Division of Colorectal Surgery, University Surgical Cluster, National University Hospital, National University Health System, 1E Kent Ridge Road, Singapore, 119228, Singapore.
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
| | - Sze Wai Leong
- Department of General Surgery, Ng Teng Fong General Hospital, National University Health System, Singapore, Singapore
| | - Christopher Hang Liang Keh
- Department of General Surgery, Ng Teng Fong General Hospital, National University Health System, Singapore, Singapore
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