[1] Spital Oberengadin, Int Ice Hockey Federat, CH-7503 Samedan, Switzerland
[2] Erasmus Univ, St Anna Hosp, Ctr Neurosci, Geldrop, Netherlands
[3] Univ Pittsburgh, Sports Concuss Program, Pittsburgh, PA USA
[4] Natl Hockey League Program, Pittsburgh, PA USA
[5] Natl Football League Neuropsychol Program, Pittsburgh, PA USA
[6] Erasmus MC, Dept Neurosci, Rotterdam, Netherlands
[7] Erasmus MC, Dept Neurosci, Rotterdam, Netherlands
[8] York Univ, Toronto, ON M3J 2R7, Canada
[9] Univ Glasgow, Dept Neuropathol, Glasgow, Lanark, Scotland
[10] Univ Bristol, Bristol, Avon, England
[11] Kopfwehzentrums, Klin Hirslanden, Zurich, Switzerland
[12] Spital Oberengadin, CH-7503 Samedan, Switzerland