[1] Vanderbilt Univ, Med Ctr, Vanderbilt Inst Med & Publ Hlth, Nashville, TN USA
[2] Vanderbilt Univ, Med Ctr, Dept Med, Nashville, TN USA
[3] Vanderbilt Univ, Med Ctr, Dept Pediat, Nashville, TN 37232 USA
[4] Univ Zimbabwe Univ Calif San Francisco Collaborat, Harare, Zimbabwe
[5] Zimbabwe Minist Hlth & Child Care, Harare, Zimbabwe
[6] WHO, Zimbabwe Country Off, Harare, Zimbabwe
[7] WHO, Intercountry Support Team East & Southern Africa, Harare, Zimbabwe
[8] WHO, Reg Off Africa, Brazzaville, Rep Congo
[9] Univ Connecticut, Dept Anthropol, Storrs, CT USA