[1] Maastricht Univ, EURON, Dept Psychiat & Neuropsychol, S Limburg Mental Hlth Res & Teaching Network, NL-6200 MD Maastricht, Netherlands
[2] Inst Psychiat, Div Psychol Med, London, England
[3] Maastricht Univ, Maastricht, Netherlands
[4] St Lucas Andreas Hosp, Dept Psychiat, Amsterdam, Netherlands
[5] Univ Hosp Maastricht, Dept Clin Chem, Maastricht, Netherlands