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Engel-Nitz NM, Miller-Wilson LA, Le L, Fisher DA. Healthcare costs, resource utilization, and productivity loss associated with colorectal cancer screening. Expert Rev Pharmacoecon Outcomes Res 2023; 23:843-852. [PMID: 37462667 DOI: 10.1080/14737167.2023.2220965] [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: 02/08/2023] [Accepted: 05/26/2023] [Indexed: 08/21/2023]
Abstract
OBJECTIVES To evaluate healthcare costs, resource utilization, associated costs, and lost productivity for colorectal cancer (CRC) screening in an average-risk population. METHODS This retrospective cohort study identified average-risk individuals (50-75 years) with claims in the Optum Research Database for CRC screening test between 1 January 2014 to 31 December 2018. Index date was defined as the first date of a claim for colonoscopy, fecal immunochemical test (FIT), guaiac-based fecal occult blood test (FOBT) or multi-target stool DNA test (mt-sDNA). Screening costs were evaluated with descriptive statistics and multivariable analyses, adjusting for patient characteristics and index screening costs. RESULTS In total, 903,831 individuals were identified by test groups: mt-sDNA (n = 29,614), FIT (n = 254,002), guaiac-based FOBT (n = 112,757) and colonoscopy (n = 507,458). Adjusted costs for index screening were, colonoscopy ($3,029), mt-sDNA ($752), FIT ($45), and (FOBT ($153). Adjusted costs across the six months following the index screening were $146 for colonoscopy, $329 for mt-sDNA, $306 for FIT, and $412 for FOBT. Colonoscopy had the highest costs for lost productivity. CONCLUSIONS Screening colonoscopy had the highest productivity loss and healthcare costs up-front, suggesting potential cost benefits for noninvasive screening modalities. The more frequent screening interval required for FIT and FOBT resulted in a higher yearly cost than colonoscopy or mt-sDNA.
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Affiliation(s)
| | | | - Lisa Le
- Health Economics and Outcomes Research, Optum, Eden Prairie, MN, USA
| | - Deborah A Fisher
- Division of Gastroenterology, Department of Medicine, Duke University, Durham, NC, USA
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Impact of colonoscopy on working productivity: a prospective multicenter observational study. Gastrointest Endosc 2022; 95:550-561.e8. [PMID: 34896099 DOI: 10.1016/j.gie.2021.11.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 11/12/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS Patients undergoing colonoscopy are often in the workforce. Therefore, colonoscopy may affect patients' work productivity in terms of missed working days and/or reduced working efficiency. We aimed to investigate the impact of colonoscopy on work productivity and factors influencing this impact. METHODS We conducted a prospective, observational, multicenter study in 10 Italian hospitals between 2016 and 2017. We collected information on individual characteristics, work productivity, symptoms, and conditions before, during, and after the procedure from patients undergoing colonoscopy for several indications using validated tools. Outcomes were interference of preparation with work, absenteeism, and impaired work performance after the procedure. We fitted multivariate logistic regression models to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for potential predictors of the outcomes. RESULTS Among 1137 subjects in the study, 30.5% reported at least 1 outcome. Impaired work performance was associated with bowel preparation regimen (full dose on the day of colonoscopy vs split dose: OR, 4.04; 95% CI, 1.43-11.5), symptoms during bowel preparation (high symptom score: OR, 3.21; 95% CI, 1.15-8.95), and pain during the procedure (OR, 2.47; 95% CI, 1.40-4.35). Increasing number of working hours and less comfortable jobs were associated with absenteeism (P for trend = .06) and impairment of working performance (P for trend = .01) and GI symptoms both before and after colonoscopy. CONCLUSIONS Occupational and individual characteristics of patients should be considered when scheduling colonoscopy because this procedure may impair work productivity in up to one-third of patients. Split-dose bowel preparation, performing a painless colonoscopy, and preventing the occurrence of GI symptoms may minimize the impact of colonoscopy on work productivity.
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Forbes N, Chau M, Koury HF, Lethebe BC, Smith ZL, Wani S, Keswani RN, Elmunzer BJ, Anderson JT, Heitman SJ, Hilsden RJ. Development and validation of a patient-reported scale for tolerability of endoscopic procedures using conscious sedation. Gastrointest Endosc 2021; 94:103-110.e2. [PMID: 33385464 PMCID: PMC8761529 DOI: 10.1016/j.gie.2020.12.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 12/18/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Patient-reported experience measures (PREMs) assessing the tolerability of endoscopic procedures are scarce. In this study, we designed and validated a PREM to assess tolerability of endoscopy using conscious sedation. METHODS The patient-reported scale for tolerability of endoscopic procedures (PRO-STEP) consists of questions within 2 domains and is administered to outpatients at discharge from the endoscopy unit. Domain 1 (intraprocedural) consists of 2 questions regarding discomfort/pain and awareness, whereas domain 2 (postprocedural) consists of 4 questions on pain, nausea, distention, and either throat or anal pain. All questions are scored on a Likert scale from 0 to 10. Cronbach's alpha was used to measure internal consistency of the questions. Multivariable logistic regression was performed to assess predictors of higher scores, reported using adjusted odds ratios and confidence intervals. RESULTS Two hundred fifty-five patients (91 colonoscopy, 73 gastroscopy, and 91 ERCP) were included. Colonoscopy was the least tolerable procedure by recall, with mean intraprocedural awareness and discomfort scores of 5.1 ± 3.8, and 2.6 ± 2.7, respectively. Consistency between intraprocedural awareness and discomfort/pain yielded an acceptable Cronbach's alpha of .71 (95% confidence interval, .62-.78). Higher use of midazolam during colonoscopy was inversely associated with an intraprocedural awareness score of 7 or higher (per additional mg: adjusted odds ratio, .23; 95% confidence interval, .09-.54). CONCLUSIONS PRO-STEP is a simple PREM that can be administered after multiple endoscopic procedures using conscious sedation. Future work should focus on its performance characteristics in adverse event prediction.
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Affiliation(s)
- Nauzer Forbes
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada,Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Millie Chau
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada
| | - Hannah F. Koury
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - B. Cord Lethebe
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Zachary L. Smith
- Department of Medicine, Division of Gastroenterology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Sachin Wani
- Division of Gastroenterology and Hepatology, University of Colorado Anschutz Medical Campus, Denver, Colorado, USA
| | - Rajesh N. Keswani
- Division of Gastroenterology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - B. Joseph Elmunzer
- Division of Gastroenterology and Hepatology, Medical University of South Carolina, Charleston, South Carolina, USA
| | - John T. Anderson
- Department of Gastroenterology, Gloucestershire Hospitals NHSFT, Gloucester, UK
| | - Steven J. Heitman
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada,Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Robert J. Hilsden
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Calgary, Calgary, Alberta, Canada,Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
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Lee M, Khan MM, Brandt HM, Salloum RG, Chen B. Decomposing socioeconomic disparities in the use of colonoscopy among the insured elderly population before and after the Affordable Care Act. Cancer Causes Control 2020; 31:1039-1048. [PMID: 32862301 DOI: 10.1007/s10552-020-01343-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 08/22/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Out-of-pocket costs may significantly dampen patients' willingness to adopt preventive procedures. This is especially true for colonoscopies, which typically involved relatively high cost-sharing requirements prior to the Affordable Care Act (ACA) implementation in 2011. PURPOSE We aim to examine the effects of income-related disparities in colonoscopy use in the years prior to and immediately after the implementation of the ACA. Further, we quantify the contributions of different factors in explaining the disparities in the use of colonoscopies among elderly population with health insurance coverage. METHODS Five cycles (2008, 2010, 2012, 2014, and 2016) of Behavioral Risk Factor Surveillance System data were utilized. To examine income-related disparities in the use of CRC, individuals aged 65-75 were included, and the concentration index (CI) was calculated before and after the implementation of ACA. To identify and quantify the contribution of different factors, a decomposition analysis of CI was conducted. RESULTS CIs decreased from 0.1935 in pre-ACA years to 0.1813 in the post-ACA years among the elderly, indicating that the disparities in the use of colonoscopy was relatively low and the disparities index declined after the implementation of ACA. Decomposition analyses showed that whereas decreases in disparities derived largely from income and educational level, higher level of income and educational attainment were major contributors to the observed disparities in colonoscopy use. CONCLUSIONS Our findings indicate that the ACA's removal of financial barriers may have contributed toward the reduction in disparities of colonoscopy use. More direct interventions, e.g., improved knowledge, better access and lower indirect cost will be helpful in improving screening among low-income and low-educational attainment households.
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Affiliation(s)
- Minjee Lee
- Department of Population Science and Policy, Southern Illinois University School of Medicine, Springfield, IL, USA. .,Simons Cancer Institute, Southern Illinois University School of Medicine, Springfield, IL, USA.
| | - M Mahmud Khan
- Department of Health Policy and Management, College of Public Health, University of Georgia, Athens, GA, USA
| | - Heather M Brandt
- Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | - Ramzi G Salloum
- Department of Health Outcomes & Biomedical Informatics, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Brain Chen
- Department of Health Services Policy and Management, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
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Hsieh YH, Tseng CW, Koo M, Leung FW. Feasibility of sedation on demand in Taiwan using water exchange and air insufflation: A randomized controlled trial. J Gastroenterol Hepatol 2020; 35:256-262. [PMID: 31420895 DOI: 10.1111/jgh.14839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/08/2019] [Accepted: 08/12/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIM Completion of colonoscopy without sedation eliminates sedation cost and complications. Reported in the United States and Europe, on-demand sedation is not routine practice in Taiwan. Water exchange (WE), characterized by infusion and nearly complete removal of infused water during insertion, reduces insertion pain compared to air insufflation (AI) during colonoscopy. We evaluated the feasibility of on-demand sedation in Taiwan. In a randomized controlled trial of WE vs AI colonoscopy, we also aimed to determine if WE augmented the implementation by reducing insertion pain and decreasing sedation requirement. METHODS This prospective patient-blinded study randomized patients to AI or WE (75 patients/group) to aid insertion. The primary outcome was the proportion of patients completing without sedation. RESULTS In the AI and WE groups, 76.0% and 93.3% (P = 0.006) completed without need for sedation, respectively. The WE group had lower insertion pain score (mean [SD]) (4.0 [2.9] vs 2.1 [2.6], P < 0.001), lower doses of propofol (25.7 [52.7] mg vs 9.1 [35.6] mg, P = 0.012), and less time in the recovery room (3.4 [7.4] vs 1.5 [5.5], P = 0.027) than the AI group. Patient satisfaction scores and willingness to repeat if needed in the future were similar. CONCLUSION On-demand sedation was feasible in Taiwan. The completion rate without sedation was high in patients (76.0% with standard AI) open to the option (no prior intent to receive the standard of full or minimal sedation). WE augmented the implementation by reducing insertion pain and decreasing sedation requirement without adversely affecting patient satisfaction or willingness to repeat.
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Affiliation(s)
- Yu-Hsi Hsieh
- Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan.,School of Medicine, Buddhist Tzu Chi University, Hualien, Taiwan
| | - Chih-Wei Tseng
- Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan.,School of Medicine, Buddhist Tzu Chi University, Hualien, Taiwan
| | - Malcolm Koo
- Graduate Institute of Long-term Care, Tzu Chi University of Science and Technology, Hualien, Taiwan.,Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Felix W Leung
- Veterans Affairs Greater Los Angeles Healthcare System, Sepulveda Ambulatory Care Center, North Hill, California, USA.,David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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Effects of the Affordable Care Act on the Receipt of Colonoscopies among the Insured Elderly. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17010313. [PMID: 31906426 PMCID: PMC6981636 DOI: 10.3390/ijerph17010313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/29/2019] [Accepted: 12/30/2019] [Indexed: 11/25/2022]
Abstract
Background: The Affordable Care Act (ACA) waived deductibles and eliminated coinsurance for colonoscopies for Medicare beneficiaries beginning in January 1, 2011. This study investigated the effect of the ACA’s directive to remove the financial barriers on the receipt of colonoscopies among the elderly insured, who are predominantly covered by Medicare. Methods: Data from the 2008–2016 Behavioral Risk Factor Surveillance System (BRFSS) were used to examine the receipt of colonoscopies in two years prior to the implementation of the ACA (2008 and 2010) and three years after the change (2012, 2014, and 2016). Multivariate logistic regressions were estimated to examine the change in colonoscopy use before and after the introduction of the ACA, adjusting for patient characteristics and availability of health care providers in the geographic region. Results: Of 349,899 eligible elderly insured in the age group 65 to 75 years, 236,275 (67.2%) had received a colonoscopy in the previous ten years. The receipt of colonoscopies increased from 63.5% in pre-ACA years to 69.2% in the post-ACA years (p < 0.001). Compared with the pre-ACA period, the odds ratio of colonoscopy uptake in post-ACA years was 1.15 (95% CI = 1.08–1.22). Conclusions: A statistically significant increase in colonoscopy use was observed in the post-ACA years. However, achieving the target coverage rate of 80% will require additional interventions to encourage higher levels of screenings.
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Nguyen NQ, Burgess J, Debreceni TL, Toscano L. Psychomotor and cognitive effects of 15-minute inhalation of methoxyflurane in healthy volunteers: implication for post-colonoscopy care. Endosc Int Open 2016; 4:E1171-E1177. [PMID: 27853742 PMCID: PMC5110336 DOI: 10.1055/s-0042-115409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 07/29/2016] [Indexed: 10/28/2022] Open
Abstract
Background and study aims: Colonoscopy with portal inhaled methoxyflurane (Penthrox) is highly feasible with low sedation risk and allows earlier discharge. It is unclear if subjects can return to highly skilled psychomotor skill task shortly after Penthrox assisted colonoscopy. We evaluated the psychomotor and cognitive effects of 15-minute inhalation of Penthrox in adults. Patients and methods: Sixty healthy volunteers (18 to 80 years) were studied on 2 occasions with either Penthrox or placebo in a randomized, double-blind fashion. On each occasion, the subject's psychomotor function was examined before, immediately, 30, 60, 120, 180 and 240 min after a 15-minute inhalation of studied drug, using validated psychomotor tests (Digit Symbol Substitution Test (DSST), auditory reaction time (ART), eye-hand coordination (EHC) test, trail making test (TMT) and logical reasoning test (LRT). Results: Compared to placebo, a 15-minute Penthrox inhalation led to an immediate but small impairment of DSST (P < 0.001), ART (P < 0.001), EHC (P < 0.01), TMT (P = 0.02) and LRT (P = 0.04). In all subjects, the performance of all 5 tests normalized by 30 minutes after inhalation, and was comparable to that with placebo. Although increasing age was associated with a small deterioration in psychomotor testing performance, the magnitude of Penthrox effects remained comparable among all age groups. Conclusions: In all age groups, a 15-minute Penthrox inhalation induces acute but short-lasting impairment of psychomotor and cognitive performance, which returns to normal within 30 minutes , indicating that subjects who have colonoscopy with Penthrox can return to highly skilled psychomotor skills tasks such as driving and daily work the same day.
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Affiliation(s)
- Nam Q. Nguyen
- Department of Gastroenterology and Hepatology. University of Adelaide, Adelaide, South Australia,Discipline of Medicine, University of Adelaide, Adelaide, South Australia ,Corresponding author Professor Nam Q Nguyen Department of Gastroenterology, Royal Adelaide HospitalNorth Terrace, Adelaide, SA 5000+61 8 8222 5207+61 8 8222 5885
| | - Jenna Burgess
- Department of Gastroenterology and Hepatology. University of Adelaide, Adelaide, South Australia
| | - Tamara L. Debreceni
- Department of Gastroenterology and Hepatology. University of Adelaide, Adelaide, South Australia
| | - Leanne Toscano
- Department of Gastroenterology and Hepatology. University of Adelaide, Adelaide, South Australia
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Non-medical costs of colonoscopy. GASTROENTEROLOGY REVIEW 2014; 9:270-4. [PMID: 25396000 PMCID: PMC4223114 DOI: 10.5114/pg.2014.46161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 02/14/2013] [Accepted: 04/04/2013] [Indexed: 11/17/2022]
Abstract
Colorectal cancer is one of the most common malignancies in Europe and North America. Colonoscopy done every 10 years beginning at age 50 is the preferred method of screening. In Poland and some other countries examinations are offered to subjects free of charge. However, as well as direct medical costs there are direct non-medical costs, which include the cost of transportation and costs related to caregivers’ time, and indirect costs, which are costs related to patients’ time. These costs essentially augment the total societal costs of colonoscopy.
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Abstract
Colorectal cancer (CRC) is a common, but preventable, disease and is the second most common cause of cancer-related deaths in the U.S. CRC screening has proven effective at reducing both the incidence and mortality of this disease, using any of a number of screening tests available. The test options range from the least invasive and least expensive to more invasive and costly options. Fecal occult blood testing is the oldest, least expensive, and least invasive of these options and has evolved from the poorly sensitive standard guaiac test to the newer and diagnostically superior fecal immunochemical test (FIT) for hemoglobin. This article explores the evolutionary history of fecal occult blood testing, examines test performance characteristics among different FOBTs, and evaluates the role of the FIT in programmatic CRC screening.
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Affiliation(s)
- Lukejohn W Day
- Division of Gastroenterology, Department of Medicine, San Francisco General Hospital and Trauma Center, 1001 Potrero Avenue, 3D-5, San Francisco, CA, 94110, USA,
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Arya V, Gupta KA, Valluri A, Arya SV, Lesser ML. Rapid colonoscopy preparation using bolus lukewarm saline combined with sequential posture changes: a randomized controlled trial. Dig Dis Sci 2013; 58:2156-66. [PMID: 23456498 PMCID: PMC3731514 DOI: 10.1007/s10620-013-2598-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2012] [Accepted: 02/07/2013] [Indexed: 12/17/2022]
Abstract
OBJECTIVE In this randomized clinical trial, we have compared the Shudh™ colon cleanse (SCC) with HalfLytely(®) colon prep (HCP) to evaluate the efficacy, bowel preparation time (BPT), adverse events, electrolyte abnormalities and patient acceptability. METHODS Patients were randomized to receive either SCC (n = 65) or HCP (n = 68). All colonoscopies were performed by a single, blinded endoscopist. Colon prep was evaluated on a 5 point grading scale. Statistical non-inferiority was pre-defined as a difference of <15 % in the lower limit of the 95.5 % confidence interval for the treatment difference. Data that were collected include bowel prep score, BPT, adverse events, electrolyte abnormalities and patient acceptability. RESULTS Bowel preparation efficacy was rated as "successful" for 59/65 (90.7 %) in SCC versus 66/68 (97.1 %) in HCP. This gave a success difference of -6.4 % with a 1-sided 95 % lower confidence limit (LCI) for the difference = -13.3 % (non-inferiority p = 0.25). This difference fell within the predefined limit for non-inferiority. The average BPT for SCC was 1.9 h versus 10.9 in HCP (p < 0.001). No serious adverse events were reported in either group. None of the patients in either group had any clinically significant electrolyte imbalance. Patient ratings for palatability and willingness to repeat were significantly better for SCC (p < 0.05). CONCLUSION SCC was found to not be inferior to PEG with regards to the quality of bowel preparation. It is worth highlighting that a major advantage of SCC is shorter BPT.
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Affiliation(s)
- Vijaypal Arya
- 75-54 Metropolitan Ave, Midldle Village, NY 11379 USA
- Weill Medical College of Cornell University, Newyork, NY USA
- Division of Gastroenterology/Hepatobiliary Diseases, Wyckoff Heights Medical Center, Brooklyn, NY USA
- Brooklyn Hospital, Brooklyn, NY USA
- North Shore University Hospital, Manhasset, NY USA
| | | | | | | | - Martin L. Lesser
- Biostatistics Unit, Feinstein Institute for Medical Research, Manhasset, NY USA
- Department of Molecular Medicine, Hofstra North Shore-LIJ School of Medicine, New Hyde Park, NY USA
- Department of Population Health, Hofstra North Shore-LIJ School of Medicine, New Hyde Park, NY USA
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Dorn SD, Fendrick AM. Waiving cost sharing for screening colonoscopy; free, but not clear. Clin Gastroenterol Hepatol 2012; 10:767-8. [PMID: 22507879 DOI: 10.1016/j.cgh.2012.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 04/02/2012] [Indexed: 02/07/2023]
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