1 Centre for Youth Mental Health, The University of Melbourne, Melbourne, VIC 3052, Australia; Orygen, Melbourne, VIC, Australia. Electronic address: rosie.purcell@orygen.org.au.
2 Athletes' Commission, Lausanne, Switzerland; International Olympic Committee, Lausanne, Switzerland.
3 Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, USA; Medical Committee, International Paralympic Committee, Bonn, Germany.
4 Medical and Scientific Department, Lausanne, Switzerland.
5 Regional Affective Disorders Service, Cumbria, Northumberland Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK.
6 Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA.
7 Family Medicine, McMaster University Michael G DeGroote School of Medicine, Waterloo, ON, Canada; Sport Medicine, The Association of Summer Olympic International Federations, Lausanne, Switzerland.
8 Major League Soccer, New York, MY, USA.
9 Department of Orthopaedic Surgery, Amsterdam Movement Sciences, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands; Section Sports Medicine, University of Pretoria, Pretoria, South Africa.