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Contributors All authors were involved in planning, conducting and reporting of the work. VDG recruited the patients, watched the videos, performed data analyses, interpreted data and wrote the first version of the manuscript. ACK, COFK and PGD conceived the study and were involved in data interpretation and manuscript writing. COFK and PGD supervised the project. All authors approved the final version of the manuscript.
Funding Endeavour Research Fellowship (Australia) for VDG (ERF_RDDH_5276_2016), NHMRC (Australia) funding Prof Peter G. Davis (App ID 1059111), Dr C. Omar F. Kamlin (App ID 1073533). NHMRC program grant for P.G.D, C.O.F.K.
Competing interests None declared.
Patient consent Parental consent obtained.
Ethics approval The Human Research and Ethics Committees of The Royal Womens Hospital, Melbourne.
Provenance and peer review Not commissioned; externally peer reviewed.