[1] Jimma Univ, Chron Dis Project, Jimma, Ethiopia
[2] Jimma Univ, Nursing Sch, Jimma, Ethiopia
[3] London Sch Hyg & Trop Med, London, England
[4] Acad Unit Primary Care & Populat Sci, Southampton, Hants, England
[5] Univ Southampton, Southampton, Hants, England
[6] Southampton Gen Hosp, MRC Lifecourse Epidemiol Unit, Tremona Rd, Southampton SO16 6YD, Hants, England