Nguyen, H. B., N. V. Nguyen, H. T. G. Tran, H. V. Nguyen, and Q. T. T. Bui. “Prevalence of Resistance to Second-Line Tuberculosis Drug Among Multidrug-Resistant Tuberculosis Patients in Viet Nam, 2011”. Western Pacific Surveillance and Response, vol. 7, no. 2, Oct. 2016, doi:10.5365/wpsar.2016.7.2.002.