POLICI: AN ONLINE TOOL FOR VISUALIZATION OF POPULATION-LEVEL YELLOW FEVER IMMUNIZATION COVERAGE IN AFRICA - Hamlet, A; Jean, K; Ferguson, N; Van, Kerkhove M; Yactayo, S; Perea, W; Biey, J; Sall, A; Garske, T (AMER SOC TROP MED & HYGIENE, 2017)