[1] Univ Nijmegen Hosp, Dept Psychiat, NL-6500 HB Nijmegen, Netherlands
[2] Univ Nijmegen Hosp, Dept Ophthalmol, NL-6500 HB Nijmegen, Netherlands
[3] Univ Nijmegen Hosp, Dept Geriatr Med, NL-6500 HB Nijmegen, Netherlands
[4] Univ Nijmegen Hosp, Dept Med Stat, NL-6500 HB Nijmegen, Netherlands
[5] Univ Nijmegen Hosp, Dept Epidemiol, NL-6500 HB Nijmegen, Netherlands