[1] MedStar Hlth, Sports & Performance Cardiol Program, 3333 North Calvert St,JPB Suite 500, Baltimore, MD 21218 USA
[2] US Olymp & Paralymp Comm, Colorado Springs, CO USA
[3] Indiana Univ, Sch Publ Hlth, Bloomington, IN USA
[4] Northwestern Univ, Dept Emergency Med, Chicago, IL 60611 USA
[5] Northwestern Univ, Dept Orthopaed Surg, Chicago, IL USA
[6] Univ Washington, Dept Family Med, Sports Med Sect, Seattle, WA 98195 USA
[7] Natl Jewish Hlth, Div Pulm Crit Care & Sleep Med, Dept Med, Dept Pediat,Div Pediat Pulmonol, Denver, CO USA
[8] Massachusetts Gen Hosp, Cardiovasc Performance Program, Boston, MA 02114 USA