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Contributors DvR developed the study concept, design and obtained funding. DvR, RD, MT collected all data. MT performed the statistical analysis. All authors interpreted the data. MT, RD, MZ-N and DvR drafted the manuscript. All authors revised the manuscript. All authors have approved the final draft.
Funding The study was supported by a research grant from Fujifilm.
Competing interests DvR is supported by a 'Fonds de Recherche du Québec Sante' career development award. He has also received research funding from ERBEElektromedizin, Ventage, Pendopharm, Fujifilm and Pentax, and has received consultant or speaker fees from Boston Scientific, ERBE Elektromedizin and Pendopharm.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Not commissioned; internally peer reviewed.
Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.