Prevalence of and risk factors for resistance to second-line drugs in people with multidrug-resistant tuberculosis in eight countries: A prospective cohort study

Tracy Dalton, Peter Cegielski, Somsak Akksilp, Luis Asencios, Janice Campos Caoili, Sang Nae Cho, Vladislav V. Erokhin, Julia Ershova, Ma Tarcela Gler, Boris Y. Kazennyy, Hee Jin Kim, Kai Kliiman, Ekaterina Kurbatova, Charlotte Kvasnovsky, Vaira Leimane, Martie Van Der Walt, Laura E. Via, Grigory V. Volchenkov, Martin A. Yagui, Hyungseok Kang