Prevalence and associated factors of HIV among female sex workers in Eastern and Southern Africa: Systematic review and meta-analysis - Tigabu Kidie Tesfie; Getaneh Awoke Yismaw; Bantie Getnet Yirsaw; Habtamu Wagnew Abuhay; Meron Asmamaw Alemayehu; Nebiyu Mekonnen Derseh; Gebrie Getu Alemu; Muluken Chanie Agimas (PLoS ONE)