[1] Univ Maryland, Sch Med, Dept Epidemiol & Publ Hlth, Baltimore, MD 21201 USA
[2] Inst Human Virol Nigeria, Off Res Training & Strateg Informat, Abuja, Fct, Nigeria
[3] Univ Maryland, Sch Med, Marlene & Stewart Greenebaum Canc Ctr, Baltimore, MD 21201 USA
[4] Univ Ilorin Teaching Hosp, Dept Ear Nose & Throat Head & Neck Surg, Ilorin, Kwara State, Nigeria
[5] Univ Benin Teaching Hosp, Benin, Edo State, Nigeria
[6] Univ Calabar Teaching Hosp, Calabar, Cross River Sta, Nigeria
[7] Univ Abuja Teaching Hosp, Abuja, Fct, Nigeria
[8] Harvard Univ, Dept Nutr, TH Chan Sch Publ Hlth, Boston, MA 02115 USA
[9] NHGRI, NIH, Bethesda, MD 20892 USA