1. Division of Pulmonology, Department of Internal Medicine, Hospital of the University of Marburg, Philipps Universität Marburg, 35043 Marburg, Germany.
2. Internal Medicine I, University Clinic Munich-Grosshadern, Ludwig Maximilians University, 81377 Munich, Germany.
3. Hämatologicum, Institute for Molecular Immunology, Forschungszentrum für Gesundheit und Umwelt (GSF), 81377 Munich, Germany.
4. Clinic I for Internal Medicine and Center for Molecular Medicine, University of Cologne, 50937 Cologne, Germany.