[1] Private Practice Oncol, Hamburg, Germany
[2] Practice Oncol Hematol, Munster, Germany
[3] Univ Hosp Essen, West German Canc Ctr, Essen, Germany
[4] Onkol Ravensburg, Munster, Germany
[5] Private Practice Oncol, Bielefeld, Germany
[6] Private Practice Oncol, Niedersachsen, Germany
[7] IOMEDICO, Freiburg, Germany
[8] Med Practice Oncol & Hematol, Freiburg, Germany