[1] Univ Washington, Dept Family Med, Seattle, WA 98195 USA
[2] Mayo Clin, Dept Med, Div Cardiovasc Dis, Rochester, MN USA
[3] Mayo Clin, Dept Pediat, Div Cardiovasc Dis, Rochester, MN USA
[4] Mayo Clin, Dept Mol Pharmacol & Expt Therapeut, Div Cardiovasc Dis, Rochester, MN USA
[5] Mayo Clin, Div Pediat Cardiol, Rochester, MN USA
[6] Univ Connecticut, Dept Athlet, Storrs, CT USA
[7] Stanford Univ, Sch Med, Div Cardiovasc Med, Palo Alto, CA 94304 USA
[8] Eisenhower Army Med Ctr, Dept Family Med, Ft Gordon, GA USA
[9] Massachusetts Gen Hosp, Div Cardiol, Boston, MA 02114 USA
[10] Karolinska Univ Hosp, Swedish Sch Sports & Hlth Sci, Dept Cardiol, Stockholm, Sweden
[11] Mayo Clin, Div Cardiovasc Dis, Rochester, MN USA
[12] Univ Padua, Dept Cardiac Thorac & Vasc Sci, Padua, Italy
[13] Univ Calif Los Angeles, Dept Family Med, Div Sports Med, Los Angeles, CA USA
[14] Emory Univ, Sch Med, Dept Pediat, Childrens Healthcare Atlanta, Atlanta, GA USA
[15] Univ Louvain, Dept Cardiovasc Sci, Louvain, Belgium
[16] Midwest Heart Fdn, Oak Brook Terrace, IL USA
[17] Univ Washington, Div Cardiol, Seattle, WA 98195 USA
[18] Univ Arizona, Dept Family & Community Med, Tucson, AZ USA
[19] Inst Sport Med & Sci, Dept Med, Rome, Italy
[20] Seattle Childrens Hosp, Div Cardiol, Seattle, WA USA
[21] Univ Zurich Hosp, Ctr Cardiovasc, Div Cardiol, CH-8091 Zurich, Switzerland
[22] St Georges Univ London, Dept Cardivasc Sci, London, England
[23] Hosp Clin Porto Alegre, Dept Cardiol, Porto Alegre, RS, Brazil
[24] Childrens Hosp Philadelphia, Div Cardiol, Philadelphia, PA 19104 USA
[25] Qatar Orthoped & Sports Med Hosp, ASPETAR, Dept Sports Med, Doha, Qatar