1. Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia, Canada
2. Centre of Hip Health and Mobility, Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada
3. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
4. Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada
5. Sunny Hill Health Centre for Children, BC Children’s Hospital, Vancouver, British Columbia, Canada
6. BC Children’s Hospital Research Institute, Vancouver, British Columbia, Canada
7. Department of Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada