[1] Vanderbilt Univ, Med Ctr, Vanderbilt Inst Global Hlth, Nashville, TN USA
[2] Vanderbilt Univ, Med Ctr, Dept Med, Nashville, TN USA
[3] Univ Zambia, Sch Med, Lusaka, Zambia
[4] Univ Connecticut, Dept Anthropol, Storrs, CT USA
[5] Zambia Minist Community Dev Mother & Child Hlth, Lusaka, Zambia
[6] WHO, Zambia Country Off, Lusaka, Zambia
[7] WHO, Reg Off Africa, Brazzaville, Rep Congo
[8] Vanderbilt Univ, Med Ctr, Dept Pediat, Nashville, TN 37232 USA