1. Division of Haematology/Oncology, Department of Medicine III,
2. Institute of Pathology,
3. Department of Nuclear Medicine, University of Erlangen‐Nu¨rnberg, Erlangen,
4. Department of Pediatrics, University of Ulm, Ulm,
5. Institute of Anatomy, University of Zu¨rich, Zürich, Switzerland
6. Institute of Immunology, GSF, Mu¨nchen, Germany,