[1] Vrije Univ Amsterdam, Med Ctr, GGZinGeest, Dept Psychiat, Postbox 74077, NL-1070 BB Amsterdam, Netherlands
[2] Univ Worcester, Assoc Dementia Studies, Worcester WR2 6AJ, England
[3] Don Carlo Gnocchi Fdn, Santa Maria Nascente IRCCS Clin Res Ctr, Via Alfonso Capecelatro 66, I-20148 Milan, Italy
[4] Wroclaw Med Univ, Dept Psychiat, Pasteura 10, PL-50367 Wroclaw, Poland
[5] Univ Nottingham, Inst Mental Hlth, Triumph Rd, Nottingham NG7 2TU, England
[6] Univ Bologna, Dept Psychol, Viale Berti Pichat 5, Bologna, Italy