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Contributors SS designed the study, led the data acquisition and interpretation, and wrote the manuscript; FM assisted with data collection and study support, KK performed the statistical analysis; ARS provided study support; DGH contributed to study design, data interpretation and manuscript preparation; all authors critically reviewed the manuscript for important intellectual content.
Competing interests DGH receives consulting fees from Olympus Corporation, Tokyo, Japan.
Ethics approval The Human Research Ethics Committee of the University of Queensland.
Provenance and peer review Not commissioned; internally peer reviewed.
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