Mapping for engagement: setting up a community based participatory research project to reach underserved communities at risk for hepatitis C in Ho Chi Minh City, Vietnam by Nguyen Quoc, G, Nguyen Le Thao, M, Bao, A, Nguyen Anh, N, Vu Thi Tuong, V, Nguyen Thi Ngoc, D, Phan, L, Phan Minh, T, Lam Ngoc, T, Nguyen Thanh, A, Nguyen Anh, T, Nguyen Nguyen Nhu, T, Nguyen Thi, L, Nguyen Thuy Thanh, V, Nguyen Minh, H, Nguyen Minh, T, Do Thuy An, M, Nguyen Tri, T, Tran Thi, P, Pham Hong, S, Tran Thi, N, Hoang Thai, A, Duong Thi My, H, Cooke, GS, Chambers, M, Van Nuil, JI