[1] Univ Gothenburg, Inst Neurosci & Physiol, Psychiat Sect, Sahlgrenska Acad, Gothenburg, Sweden
[2] Vrije Univ Amsterdam, Dept Epidemiol & Biostat, Longitudinal Aging Study Amsterdam, Med Ctr,EMGO Inst Hlth & Care Res, Amsterdam, Netherlands
[3] Univ Munich LMU, Roseneck Hosp Behav Med, Munich, Germany
[4] Univ Munich LMU, Dept Psychiat, Munich, Germany
[5] St James Hosp, Dept Psychiat, Jonathan Swift Clin, Dublin 8, Ireland
[6] Univ Zaragoza, Serv Psicomat, E-50009 Zaragoza, Spain
[7] Free Univ Berlin, Psychiat Klin & Poliklin, Berlin, Germany
[8] Univ Liverpool, Dept Psychiat, Old Age Psychiat Sect, Liverpool L69 3BX, Merseyside, England