[1] Fred Hutchinson Canc Res Ctr, Vaccine & Infect Dis Div, 1124 Columbia St, Seattle, WA 98104 USA
[2] Univ Washington, Biostat, Seattle, WA 98195 USA
[3] Univ Washington, Lab Med, Seattle, WA 98195 USA
[4] Univ Washington, Med, Seattle, WA 98195 USA
[5] Univ Zimbabwe, Coll Hlth Sci, Clin Trials Res Ctr, Harare, Zimbabwe
[6] Magee Womens Res Inst, Pittsburgh, PA USA
[7] Univ Pittsburgh, Pittsburgh, PA USA
[8] Magee Womens Res Inst, Obstet Gynecol & Reprod Sci, Pittsburgh, PA USA
[9] Univ Alabama Birmingham, Med, Birmingham, AL USA