title: [Is it necessary to add a fourth drug to the initial treatment of tuberculosis?].
authors: N M
authors: NM
authors: Casabona
authors: J A
authors: JA
authors: Caylà
mesh_terms: D000995:Antitubercular Agents / Q000627:therapeutic use*; D006801:Humans; D013030:Spain; D018088:Tuberculosis, Multidrug-Resistant / Q000188:drug therapy*
chemical_list: D000995:Antitubercular Agents