1 Department of Pulmonary Diseases and Tuberculosis, University Medical Center Groningen, University of Groningen, P.O. Box 30001, 9700 RB, Groningen, The Netherlands. [email protected].
2 Department of Pulmonary Diseases and Tuberculosis, University Medical Center Groningen, University of Groningen, P.O. Box 30001, 9700 RB, Groningen, The Netherlands.