[1] Med Univ Innsbruck, Dept Neurol, A-6020 Innsbruck, Austria
[2] Univ Cambridge, Dept Publ Hlth & Primary Care, Cambridge, England
[3] Med Univ Innsbruck, Div Genet Epidemiol, A-6020 Innsbruck, Austria
[4] Hosp Bruneck, Dept Lab Med, Brunico, Italy
[5] Hosp Bruneck, Dept Internal Med, Brunico, Italy
[6] Med Univ Innsbruck, Dept Internal Med 6, A-6020 Innsbruck, Austria
[7] Univ Calif San Diego, Dept Med, La Jolla, CA 92093 USA