[1] Youth Sports Amer, Birmingham, AL USA
[2] Lemak Sports Med, Birmingham, AL USA
[3] McMaster Univ, Dept Family Med, Michael G DeGroote Sch Med, Hamilton, ON L8S 4L8, Canada
[4] IOC Med Commiss, Games Grp, Stockholm, Sweden
[5] Univ Exeter, Childrens Hlth & Exercise Res Ctr, Exeter, Devon, England
[6] Nanyang Technol Univ, Phys Educ & Sports Sci, Natl Inst Educ, Singapore 639798, Singapore
[7] Queens Univ, Sch Kinesiol & Hlth Studies, Kingston, ON, Canada
[8] Univ Calgary, Res Inst Child & Maternal Hlth Pediat & Community, Alberta Childrens Hosp, Calgary, AB, Canada
[9] Coll New Jersey, Dept Hlth & Exercise Sci, Ewing, NJ USA
[10] Hallway Consulting, Los Olivos, CA USA
[11] Univ Zurich, Inst Epidemiol Biostat & Pravent, Grp Children Phys Act & Hlth CHIPAH, CH-8006 Zurich, Switzerland
[12] Int Gymnast Federat FIG, Paris, France
[13] Univ Texas Austin, Austin, TX 78712 USA
[14] Tarleton State Univ, Stephenville, TX USA
[15] Norwegian Sch Sport Sci, Dept Coaching & Psychol, Oslo, Norway
[16] Int Basketball Federat FIBA, Zurich, Switzerland
[17] Int Olymp Comm, Dept Med Sci, Lausanne, Switzerland
[18] Norwegian Sch Sports Sci, Dept Sports Med, Oslo, Norway
[19] Vrije Univ Amsterdam, Med Ctr Amsterdam, Dept Publ & Occupat Hlth, Amsterdam, Netherlands
[20] Vrije Univ Amsterdam, EMGO Inst, Med Ctr Amsterdam, Amsterdam, Netherlands
[21] Univ Queensland, Sch Human Movement & Nutr Sci, Brisbane, Qld, Australia
[22] Univ Cape Town, Dept Human Biol, Div Exercise Sci & Sports Med, ZA-7925 Cape Town, South Africa
[23] Australian Inst Sport, Athlete Pathways & Dev, Bruce, ACT, Australia
[24] Ullevaal Univ Hosp, Orthopaed Ctr, Oslo, Norway