Evaluation of microscopic observation drug susceptibility assay for diagnosis of multidrug-resistant Tuberculosis in Viet Nam - Minh Ha, D; Ngoc Lan, N; Wolbers, M; Kiet, V; Thanh Hang, H; Duc, N; Huong, T; Bach, V; Phuong Thao, N; Quyet, T; Bich Tuyen, N; Ha, V; et al. (BMC Infectious Diseases, 2012)