[1] Populat Council, India Habitat Ctr, New Delhi 110003, India
[2] Govt Med Coll, Dept Obstet & Gynaecol, Nagpur 440003, Maharashtra, India
[3] Columbia Univ, Mailman Sch Publ Hlth, Dept Epidemiol, New York, NY 10032 USA
[4] Populat Council, Formerly, New Delhi 110003, India
[5] Govt Med Coll, Dept Prevent & Social Med, Nagpur 440003, Maharashtra, India