RT Journal Article SR Electronic T1 Impaired detection of M. tuberculosis immunity upon high levels of immunosuppressive drugs JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00013409 A1 U. Sester A1 H. Wilkens A1 K. van Bentum A1 M. Singh A1 G.W. Sybrecht A1 H-J. Schäfers A1 M. Sester YR 2009 UL http://erj.ersjournals.com/content/early/2009/04/22/09031936.00013409.abstract AB