[1] All India Inst Med Sci, Ctr Community Med, New Delhi 110029, India
[2] All India Inst Med Sci, Dept Biostat, New Delhi, India
[3] All India Inst Med Sci, Dept Psychiat, New Delhi, India
[4] Integral Inst Med Sci & Res, Dept Community Med, Lucknow, Uttar Pradesh, India