[1] Univ Kuopio, Dept Neurosci & Neurol, FIN-70211 Kuopio, Finland
[2] Univ Kuopio, Dept Publ Hlth & Gen Practice, FIN-70211 Kuopio, Finland
[3] Finnish Natl Publ Hlth Inst, Helsinki, Finland
[4] Karolinska Inst, Aging Res Ctr, Neurotec, Stockholm, Sweden