1. From the Institute for Biomedical Ageing Research (M. Knoflach, M. Kind, G.W.), Austrian Academy of Sciences, Innsbruck, Austria; Department of Neurology (S.K., J.W.), University Clinics, Innsbruck, Austria; Military Hospital 2 (M.S., M.G.), Innsbruck, Austria; Military Recruiting Bureau (R.S.), Innsbruck, Austria; Department of Infectious Diseases and Immunology (R.v.d.Z.), Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands; Department of Medicine (H.G.), University of...