1 University of Zurich and Tuberculosis Center of the Swiss Lung Association, Zurich, Department of Pulmonary Medicine, Cantonal Hospital St Gallen, St Gallen.
2 Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Tuberculosis Consultant Services, Kirchlindach, Switzerland <email></email>, Email: otto.schoch@kssg.ch.