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Garg A, Kumar J, Katoch D, Dutta S, Kumar P. Diagnostic Accuracy of Pediatrician-performed Digital Retinal Imaging with 3nethra neo for ROP Screening. Indian J Pediatr 2024:10.1007/s12098-024-05042-z. [PMID: 38372940 DOI: 10.1007/s12098-024-05042-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 01/12/2024] [Indexed: 02/20/2024]
Abstract
OBJECTIVES To evaluate the accuracy of pediatrician-performed wide-field digital retinal imaging (WFDRI) for diagnosing Retinopathy of prematurity (ROP), as compared to binocular indirect ophthalmoscopy (BIO) as the reference standard. METHODS Eligible infants undergoing ROP screening were enrolled consecutively. BIO was performed by trained ophthalmologists, followed by WFDRI (using "3nethra neo" camera) by a pediatrician. An expert pediatric ophthalmologist reviewed de-identified images for quality, presence, and severity of ROP. She was masked to the findings of BIO and the pediatrician. Diagnostic accuracy for detecting any ROP, ROP requiring treatment (Type 1), and ROP requiring referral (Type 1 or 2) were calculated for WFDRI, considering BIO as the reference standard. RESULTS The analysis included 427 eyes. The sensitivity, specificity, positive likelihood ratio (PLR), negative likelihood ratio (NLR), diagnostic accuracy, and diagnostic odds ratio of WFDRI were 0.88 (95% CI: 0.81, 0.93), 0.89 (0.85, 0.92), 7.8 (5.7, 10.9), 0.14 (0.09, 0.21), 0.89 (0.85, 0.91), and 58.3 (31, 110) respectively for detection of 'any ROP'. For detecting ROP requiring treatment (Type 1), the sensitivity, specificity, NLR, and diagnostic accuracy were 0.90 (0.75, 0.97), 1.00 (0.99, 1.00), 0.11 (0.04, 0.27), and 0.99 (0.98, 1.00) respectively. For ROP requiring referral, the sensitivity, specificity, NLR, and diagnostic accuracy of pediatrician-performed WFDRI were 0.92 (0.80, 0.98), 1.00 (0.99, 1.00), 0.08 (0.03, 0.21), and 0.99 (0.98, 1.00) respectively. No serious adverse events were noted. The pediatrician and ophthalmologist had a near-perfect (k-1.00) and strong (k-0.88) agreement for ROP requiring treatment and any ROP, respectively. CONCLUSIONS Pediatrician-performed WFDRI is feasible, safe, and has excellent diagnostic accuracy for identifying ROP requiring treatment.
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Affiliation(s)
- Ashok Garg
- Neonatal Unit, Advanced Pediatric Center, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Jogender Kumar
- Neonatal Unit, Advanced Pediatric Center, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India.
| | - Deeksha Katoch
- Advanced Eye Centre, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Sourabh Dutta
- Neonatal Unit, Advanced Pediatric Center, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Praveen Kumar
- Neonatal Unit, Advanced Pediatric Center, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
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Wang J, Liu C, Wu H, Ng TK, Zhang M. Diagnostic Accuracy of Wide-Field Digital Retinal Images in Retinopathy of Prematurity Detection: Systematic Review and Meta-Analysis. Curr Eye Res 2022; 47:1024-1033. [PMID: 35435102 DOI: 10.1080/02713683.2022.2050262] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE To evaluate the diagnostic accuracy of the wide-field digital retinal imaging (WFDRI) for the detection of Retinopathy of Prematurity (ROP) in premature infants as compared to the binocular indirect ophthalmoscopy (BIO). METHODS This systematic review and meta-analysis included the publications searched through PubMed (Medline), EMBASE, Scopus, Web of Science, Cochrane Library databases and Clinical Trials. The Quality Assessment of Diagnostic Accuracy Studies (QUADAS)-2, the hierarchical summary receiver operating characteristic, meta-regression, publication bias analyses, and the GRADE methodology for the certainty of the overall evidence were conducted. The pooled effect sizes of the sensitivity, specificity, positive likelihood ratio (PLR), negative likelihood ratio (NLR) and diagnostic odds ratio (DOR) were calculated. RESULTS Total sixteen eligible studies from 10 articles were included with total 2,537 image interpretations from 697 premature infants. Less than 50% risk of bias and low concern were found in each domain across all articles by QUADAS-2. The pooled effect sizes showed the sensitivity of 0.77 (95% confidence interval (C.I.): 0.69-0.84), specificity of 0.96 (95% C.I.: 0.92-0.98), PLR of 20.9 (95% C.I.: 10.2-42.5), NLR of 0.23 (95% C.I.: 0.17-0.33) and DOR of 89 (95% C.I.: 43-185) as compared to BIO. The income level, setting, mean/median birth weight and gestational age contributed to the significant differences in sensitivity (p < 0.001). No publication bias was found among these 16 studies. The GRADE quality of evidence showed moderate for the pooled sensitivity and high for the pooled specificity. CONCLUSIONS The diagnostic accuracy based on WFDRI is substantial and comparable to BIO, supporting its application in the ROP screening programs.
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Affiliation(s)
- Ji Wang
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Shantou University Medical College, Shantou, Guangdong, China
| | - Cui Liu
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Shantou University Medical College, Shantou, Guangdong, China
| | - Huan Wu
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Shantou University Medical College, Shantou, Guangdong, China
| | - Tsz Kin Ng
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
- Shantou University Medical College, Shantou, Guangdong, China
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Mingzhi Zhang
- Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong, Shantou, Guangdong, China
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Kung FF, Xu TT, Leavitt JA, Lossen VI, Lai KE, Ko MW, Bhatti MT, Chen JJ. Characterization and Utility of Remote Interpretation of Visual Field Diagnostic Testing in an Academic Center. J Neuroophthalmol 2022; 42:e1-e7. [PMID: 35051987 DOI: 10.1097/wno.0000000000001481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND The use of remote interpretation of data has risen in neuro-ophthalmology to increase efficiency and maintain social distancing due to the coronavirus disease-19 pandemic. The purpose of this study is to characterize the use and efficiency of remote interpretation of visual fields (VFs) in an academic center and to determine how often the VF interpretation was consistent with the patient's clinical history and imaging at the time of the consult. METHODS This is a retrospective study at a single academic center that enrolled all patients receiving a remote interpretation of VF from January 1, 2012, through December 31, 2012. Data were collected regarding the referring department, indication for the VF, interpretation of the VF and comparison with any prior VFs, any associated interventions with the VF, and available follow-up VFs. The main outcome measures included 1) characterizing the use of remote VF interpretations and 2) how many remote VF interpretation results were consistent with the referring diagnosis based on the patient's clinical history and imaging. RESULTS One hundred eighty patients received remote interpretation of VFs. The most frequent referring departments were endocrinology (79; 44%), neurology (51; 28%), and neurosurgery (43; 24%). The VF indications included parasellar lesion (107; 59%), seizure disorder (26; 14%), meningioma (19; 11%), vascular lesion (11; 6%), and others (17; 9%). There were 78 patients (43%) that had an intervention before the VF, whereas 49 (27%) were preoperative VFs. Eighty-seven (48%) of the VFs were interpreted as abnormal. Of all the 180 remote interpretation of VFs, 156 (87%) had VF interpretations that were consistent with the clinical question posed by the referring provider based on clinical history and imaging. Among the other 24 remote VF interpretations (13% of total remote VF interpretations), there was no clear interpretation because of either additional unexpected VF defects (n = 5, 21%), VF defect mismatch (n = 6, 25%), or unreliable VFs (n = 13, 54%). The median wait time for patients receiving remote VF interpretations was 1 day. CONCLUSIONS Remote interpretation of VFs was most often requested by endocrinology, neurology, and neurosurgery and could be performed very quickly. The most common indications were parasellar lesions, and just less than half of patients receiving remote VF interpretations had a prior intervention. A majority of remote VF interpretations were able to answer the clinical question, given the patient's clinical history and imaging. Remote interpretation of VFs may thus offer referring departments a more efficient method of obtaining VF interpretations than in-office neuro-ophthalmology examinations.
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Affiliation(s)
- Felix F Kung
- Mayo Clinic Alix School of Medicine (FFK, TTX), Mayo Clinic, Rochester, Minnesota; Departments of Ophthalmology (JAL, VIL, MTB, JJC) and Neurology (JAL, MTB, JJC), Mayo Clinic, Rochester, Minnesota; Circle City Neuro-Ophthalmology (KEL), Carmel, Indiana; Neuro-Ophthalmology Section (KEL), Midwest Eye Institute, Carmel, Indiana; Ophthalmology Service (KEL), Richard L. Roudebush Veterans Administration Medical Center, Indianapolis, Indiana; and Departments of Ophthalmology (KEL, MWK) and Neurology and Neurosurgery (MWK), Indiana University School of Medicine, Indianapolis, Indiana
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Zeng X, Chen M, Zheng L, Tian R, Chen Y, He H, Zeng J, He J, Zhang G. Study of the Biological Developmental Characteristics of the Eye in Children After Laser Surgery for the Treatment of Retinopathy of Prematurity. Front Med (Lausanne) 2022; 8:783552. [PMID: 35145976 PMCID: PMC8823663 DOI: 10.3389/fmed.2021.783552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 12/20/2021] [Indexed: 11/26/2022] Open
Abstract
Objective To observe the differences in ocular biology between premature infants who had undergone retinal laser photocoagulation (LP) for retinopathy of prematurity (ROP) and full-term infants and to investigate the relationships between these differences and the development of the refractive state. Methods This retrospective, cross-sectional study included 25 children (50 eyes) who had undergone laser treatment for aggressive posterior retinopathy of prematurity (AP-ROP), ROP in zone I requiring treatment, or ROP in zone II requiring treatment in the posterior pole (laser group) and 29 full-term infants (58 eyes) who had not (control group). Basic information, spherical equivalent (SE), and best corrected visual acuity (BCVA) were collected from the two groups. Their mean ages were 7.32 ± 2.85 and 7.34 ± 2.57 years, respectively (t = −0.047, P = 0.96). Ocular biology data were measured using an IOL Master 700 instrument (Carl Zeiss Meditec AG) and the data were processed using MATLAB (R2016a, Mathworks Inc.). The data markers included central corneal thickness (CCT), anterior and posterior surface corneal curvature radius (CCR), anterior chamber depth (ACD), lens thickness (LT), lens anterior surface curvature radius, lens posterior surface curvature radius, and eye axis length (AL). Optometric data were collected simultaneously and all BCVA values were converted to the logarithm of the minimum angle of resolution (LogMAR) for analysis. The data were statistically analyzed using SPSS software (V.23.0). Independent sample t-tests were used for the assessment of ocular biology and refractive indices in both groups of children and Pearson correlation coefficients were used to evaluate the correlations between age, gestational age at birth and ocular biology structural parameters. P < 0.05 was considered statistically significant. Results Comparisons of ocular biomarkers, refractive status, and BCVA between children in the laser and control groups showed relationships among ocular biomarkers, including the corneal-related parameters of CCT (0.54 ± 0.04 mm and 0.56 ± 0.03 mm, t = −2.116, P < 0.05), anterior surface CCR (7.53 ± 0.33 mm and 7.84 ± 0.30 mm, t = −5.063, P < 0.05), posterior surface CCR (6.75 ± 0.34 mm and 7.03 ± 0.24 mm, t = −4.864, P < 0.05); as well as those related to anterior chamber depth (ACD) were 3.24 ± 0.26 mm and 3.64 ± 0.26 mm, respectively (t = −8.065, P < 0.05), lens-related parameters (LT) were 3.80 ± 0.19 mm and 3.45 ± 0.16 mm, respectively (t = 10.514, P < 0.05); anterior lens surface curvature radius were 10.02 ± 0.93 mm and 10.52 ± 0.85 mm, respectively (t = −2.962, P < 0.05); posterior lens surface curvature radius were 5.55 ± 0.51 mm and 5.80 ± 0.36 mm, respectively (t = −2.917, P < 0.05), and ocular axis (AL) were 22.60 ± 1.42 mm and 23.45 ± 1.23 mm, respectively (t = −3.332, P < 0.05). Moreover, comparison of refractive status and BCVA between two groups of children showed an SE of −1.23 ± 3.38 D and −0.07 ± 2.00 D (t = −2.206, P < 0.05) and LogMAR (BCVA) of 0.12 ± 0.13 and 0.05 ± 0.11 (t = 3.070, P < 0.05). Analysis of the correlations between age and ocular biomarkers and refractive status of children in the laser and control groups showed correlations between age and ocular biomarkers in the two groups, in which age in the laser group was positively correlated with AL (r = 0.625, P < 0.05) but not with other biomarkers (P > 0.05). Age in the control group was negatively correlated with CCT, ACD, and AL (r = 0.303, 0.468, 0.703, P < 0.05), as well as with LT (r = −0.555, P < 0.05), with no correlation with other biomarkers (P > 0.05). Analysis of the correlation between age and refractive status of children in both groups showed that the age of children in both laser and control groups was negatively correlated with SE (r = −0.528, −0.655, P < 0.05) and LogMAR (BCVA) (r = −0.538, −0.542, P < 0.05). Analysis of the correlations between refractive status and ocular biomarkers in children in the laser and control groups showed that the refractive status in children in the laser group was negatively correlated with AL (r = −0.773, P < 0.05) but not with other biomarkers in this group (P > 0.05). The refractive status of children in the control group was negatively correlated with ACD and AL (r = −0.469, −0.734, P < 0.05), positively correlated with LT (r = 0.364, P < 0.05), and was not correlated with other biomarkers in this group (P > 0.05). Analysis of the correlations of gestational age at birth with ocular biomarkers and refractive status in children in the laser group showed a positive correlation between gestational age at birth and AL (r = 0.435, P < 0.05) but no other correlations with the other biomarkers (P > 0.05). Moreover, gestational age at birth was negatively correlated with SE (r = −0.334, P < 0.05) and LogMAR (BCVA) (r = −0.307, P < 0.05) in children in the laser group. Conclusions Compared to full-term infants, the development of CCT, ACD, LT, and AL was relatively delayed after ROP laser surgery, resulting in thin central corneal thickness, steep corneas, shallow anterior chambers, thicker lenses, “rounder” lens morphology, increased refractive power, and short eye axes, leading to the development of myopia. The changes in refractive status were mainly influenced by increased lens thickness. The results of this study showed that the lower the gestational age at birth, the greater the effects on emmetropization in children after ROP, and the more likely the development of myopia.
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Affiliation(s)
- Xianlu Zeng
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Miaohong Chen
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Lei Zheng
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Ruyin Tian
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Yi Chen
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Honghui He
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Jian Zeng
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
| | - Jicang He
- New England College of Optometry, Boston, MA, United States
- Jicang He
| | - Guoming Zhang
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Affiliated Shenzhen Eye Hospital of Jinan University, Shenzhen University School of Medicine, Shenzhen, China
- *Correspondence: Guoming Zhang
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Plasma metabolites in treatment-requiring retinopathy of prematurity: Potential biomarkers identified by metabolomics. Exp Eye Res 2020; 199:108198. [PMID: 32828955 DOI: 10.1016/j.exer.2020.108198] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 08/02/2020] [Accepted: 08/13/2020] [Indexed: 02/08/2023]
Abstract
Retinopathy of prematurity (ROP) is a potentially blinding condition caused by disruption of retinal vascularization and metabolism. This study aims to identify altered metabolites from plasma in patients with treatment-requiring ROP (TR-ROP) compared with controls. An untargeted metabolomics analysis was performed to reveal the metabolomic profiles of the plasma between TR-ROP patients (n = 38) and age-matched infants (n = 23). The Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were conducted to explore the potential signaling pathways of the changed metabolites. Under positive ion mode, a total of 29 metabolites were significantly altered in plasma between TR-ROP patients and controls, and 23 altered metabolites were identified under negative ion mode. KEGG analyses indicated that "protein digestion and absorption" and "aminoacyl-tRNA biosynthesis" were the most enriched pathways of the altered metabolites. These results demonstrated that metabolomic profiles changed in plasma of TR-ROP, and the altered metabolites could be served as potential biomarkers for the diagnosis and prognosis of TR-ROP patients. Besides, the metabolomic profiles might provide clues to discover novel therapeutic strategies in ROP treatment.
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Athikarisamy SE, Lam GC, Ross S, Rao SC, Chiffings D, Simmer K, Bulsara MK, Patole S. Comparison of wide field imaging by nurses with indirect ophthalmoscopy by ophthalmologists for retinopathy of prematurity: a diagnostic accuracy study. BMJ Open 2020; 10:e036483. [PMID: 32759245 PMCID: PMC7409991 DOI: 10.1136/bmjopen-2019-036483] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVES Retinopathy of prematurity (ROP) is a vasoproliferative disease of the preterm retina with the potential to cause irreversible blindness. Timely screening and treatment of ROP are critical. Neonatal nurses trained in wide field digital retinal photography (WFDRP) for screening may provide a safe and effective strategy to reduce the burden of ophthalmologists in performing binocular indirect ophthalmoscopy (BIO). The objective of the study was to determine the diagnostic accuracy of WFDRP in the diagnosis of referral warranting ROP (RWROP). DESIGN Prospective diagnostic accuracy study. SETTING A tertiary neonatal intensive care unit in Perth, Western Australia. PARTICIPANTS Preterm infants who fulfilled the Australian ROP screening criteria (gestational age (GA) <31 weeks, birth weight (BW) <1250 g). INTERVENTION Sets of 5-6 images per eye (index test) were obtained within 24-48 hours prior to or after the BIO (reference standard), and uploaded onto a secured server. A wide field digital camera (RetCam, Natus, Pleasanton, California, USA) was used for imaging. A paediatric ophthalmologist performed the BIO. The ophthalmologists performing BIO versus reporting the images were masked to each other's findings. PRIMARY OUTCOME The area under the receiver operating characteristic (ROC) curve was used as a measure of accuracy of WFDRP to diagnose RWROP. RESULTS A total of 85 infants (mean BW; 973.43 g, mean GA; 29 weeks) underwent a median of two sessions of WFDRP. There were 188 episodes of screening with an average of five images per eye. WFDRP identified RWROP in 7.4% (14/188 sessions) of examinations. In one infant, BIO showed bilateral plus disease and WFDRP did not pick up the plus disease. WFDRP image interpretation had a sensitivity of 80%, specificity of 94.5% for the detection of RWROP. The 'area under the ROC curve' was 88% when adjusted for covariates. CONCLUSIONS WFDRP by neonatal nurses was feasible and effective for diagnosing RWROP in our set up. TRIAL REGISTRATION NUMBER ACTRN12616001386426.
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Affiliation(s)
- Sam Ebenezer Athikarisamy
- Department of Neonatology, Perth Children's Hospital, Perth, Western Australia, Australia
- Department of Neonatology, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Medicine, University of Western Australia, Perth, Western Australia, Australia
| | - Geoffrey Christopher Lam
- Department of Ophthalmology, Perth Children's Hospital, Nedlands, Western Australia, Australia
- Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, Western Australia, Australia
| | - Stuart Ross
- Department of Ophthalmology, Midland Swan Valley Clinic, Perth, Western Australia, Australia
| | - Shripada Cuddapah Rao
- Department of Neonatology, Perth Children's Hospital, Perth, Western Australia, Australia
- Department of Neonatology, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Medicine, University of Western Australia, Perth, Western Australia, Australia
| | - Debbie Chiffings
- Department of Neonatology, Perth Children's Hospital, Perth, Western Australia, Australia
- Department of Neonatology, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Medicine, University of Western Australia, Perth, Western Australia, Australia
| | - Karen Simmer
- Department of Neonatology, Perth Children's Hospital, Perth, Western Australia, Australia
- Department of Neonatology, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Medicine, University of Western Australia, Perth, Western Australia, Australia
| | - Max K Bulsara
- Biostatistics, Institute for Health Research, University of Notre Dame, Perth, Western Australia, Australia
| | - Sanjay Patole
- Department of Neonatology, King Edward Memorial Hospital for Women, Perth, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Medicine, University of Western Australia, Perth, Western Australia, Australia
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