[1] Res Triangle Inst, Dept Stat & Epidemiol, Durham, NC 27709 USA
[2] Inst Clin Effectiveness, Buenos Aires, DF, Argentina
[3] Jawaharlal Nehru Med Coll, Belgaum, India
[4] Aga Khan Univ, Karachi, Pakistan
[5] Moi Univ, Eldoret, Kenya
[6] Lata Med Res Fdn, Nagpur, Maharashtra, India
[7] Indira Med Coll, Nagpur, Maharashtra, India
[8] Univ Zambia, Lusaka, Zambia
[9] San Carlos Univ, Guatemala City, Guatemala
[10] Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Bethesda, MD USA
[11] Christiana Hlth Care, Newark, DE USA
[12] Indiana Univ, Indianapolis, IN 46204 USA
[13] Massachusetts Gen Hosp Children, Boston, MA USA
[14] Univ Alabama Birmingham, Birmingham, AL USA
[15] Univ Colorado, Hlth Sci Ctr, Denver, CO USA
[16] Tulane Sch Publ Hlth & Trop Med, New Orleans, LA USA
[17] Univ Cincinnati, Cincinnati, OH USA
[18] Columbia Univ, New York, NY USA