1. Faculty of Sport Sciences, Waseda University, Tokyo, Japan
2. The Micheli Center for Sports Injury Prevention, Waltham, MA, USA
3. Sports Medicine Division, Department of Orthopaedics, Boston Children’s Hospital, Boston, MA, USA
4. Harvard Medical School, Boston, MA, USA
5. Department of Pediatrics, Division of Emergency Medicine, Boston Children’s Hospital, Boston, MA, USA