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Contributors JFB-C gathered the data, made the statistical analysis, conceptualised and wrote the first draft of the manuscript. JJ gathered the data, conceptualised and reviewed the manuscript.
Competing interests None declared.
Patient consent Obtained.
Ethics approval This is a retrospective, observational study, but patients signed written informed consent to be videotaped and release of specific health information for research and educational purposes such as publishing in professional journals.
Provenance and peer review Not commissioned; internally peer reviewed.