[1] BRAC James P Grant Sch Publ Hlth, Dhaka 1213, Bangladesh
[2] Bangladesh icddr b, Int Ctr Diarrhoeal Dis Res, Maternal & Child Hlth Div, Dhaka 1212, Bangladesh
[3] Uppsala Univ, Dept Womens & Childrens Hlth, MTC huset, Dag Hammarskjolds vag 14B, SE-75237 Uppsala, Sweden
[4] North Carolina State Univ, Raleigh, NC 27695 USA
[5] Univ Canberra, Hlth Res Inst, Fac Hlth, Canberra 2617, Australia
[6] Friendship, Ka-14-2A,Baridhara North Rd, Dhaka 1212, Bangladesh
[7] icddr b, Maternal & Child Hlth Div, Dhaka, Bangladesh