Methodological lessons from a cohort study of high risk women in Tanzania
O Hoffmann, B Zaba, B Wolff, E Sanga, L Maboko, D Mmbando, F von Sonnenburg, M Hoelscher
Sexually Transmitted Infections Dec 2004, 80 (suppl 2) ii69-ii73; DOI: 10.1136/sti.2004.011908