Page 1/14 Evaluation of a Liquid Chromatography-Tandem Mass Spectrometry Assay for Second-line Tuberculosis Drug Concentrations in Small Hair Samples John Metcalfe (  John.Metcalfe@ucsf.edu ) University of California San Francisco Peter Bacchetti University of California San Francisco Ali Esmail University of Cape Town Lung Institute Andrew Reckers University of California San Francisco David Aguilar University of California San Francisco Anita Wen University of California San Francisco Shu Huo University of California San Francisco Winnie R. Muyindike Mbarara University of Science and Technology Judith A. Hahn University of California San Francisco Keertan Dheda University of Cape Town Lung Institute Monica Gandhi University of California San Francisco Roy Gerona University of California San Francisco Research article Keywords: LC-MS/MS; hair; drug-resistant tuberculosis; diagnostic accuracy Posted Date: September 23rd, 2019