[1] Helios Clin Berlin Buch, Berlin, Germany
[2] Max Delbruck Cntr, Berlin, Germany
[3] Expt & Clin Rsch Cntr, Berlin, Germany
[4] Hannover Med Sch, D-3000 Hannover, Germany
[5] Columbia Univ, Coll Phys & Surg, Dept Microbiol & Immunol, New York, NY USA
[6] Helmholtz Zentrum Munchen, German Rsch Cntr Environm Hlth, Inst Toxicol, Neuherberg, Germany
[7] Tech Univ Munich, Klinikum Rechts Isar, D-8000 Munich, Germany