Evaluation of the GeneXpert MTB/RIF in patients with presumptive tuberculous meningitis by Metcalf, T, Soria, J, Montano, SM, Ticona, E, Evans, CA, Huaroto, L, Kasper, M, Ramos, ES, Mori, N, Jittamala, P, Chotivanich, K, Chavez, IF, Singhasivanon, P, Pukrittayakamee, S, Zunt, JR