[1] Univ Hawaii, Canc Res Ctr Hawaii, Canc Etiol Program, Honolulu, HI 96813 USA
[2] Univ Yaounde 1, Fac Med & Biomed Sci, Dept Internal Med, Diabet & EndocrineUnit, Yaounde, Cameroon
[3] Manchester Royal Infirm, Dept Med, Manchester M13 9WL, Lancs, England
[4] Univ Leeds, Nuffield Inst Hlth, Div Publ Hlth, Leeds, W Yorkshire, England
[5] Univ Yaounde 1, Fac Med & Biomed Sci, Dept Publ Hlth, Yaounde, Cameroon