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1Department of Orthopaedics, Faculty of Medicine, University of British Columbia,
Vancouver, British Columbia, CANADA; 2Centre for Hip Health and Mobility, Vancouver
Coastal Health Research Institute, Vancouver, British Columbia, CANADA; 3Department
of Family Medicine, Faculty of Medicine, University of British Columbia, Vancouver,
British Columbia, CANADA; 4Child and Family Research Institute, BC Women's and Children's
Hospital, Vancouver, British Columbia, CANADA; 5College of Kinesiology, University
of Saskatchewan, Saskatoon, Saskatchewan, CANADA; 6Centre for Global Health and Human
Development, Department of Sport, Exercise and Health Sciences, Loughborough University,
Leicestershire, UNITED KINGDOM; 7Centre for Clinical Epidemiology and Evaluation,
Vancouver Coastal Health Research Institute, Vancouver, British Columbia, CANADA;
and 8Department of Statistics, Faculty of Science, University of British Columbia,
Vancouver, British Columbia, CANADA.