[1] Karolinska Inst, Dept Global Publ Hlth, Stockholm, Sweden
[2] Indian Council Med Res, Ctr Ageing & Mental Hlth, Kolkata, India
[3] Calcutta Pavlov Hosp, Calcutta Natl Med Coll, Dept Psychiat, Kolkata, India
[4] Indian Council Med Res, Ctr Ageing & Mental Hlth, Kolkata, India
[5] All India Inst Med Sci, Dept Psychiat, Kalyani, W Bengal, India