[1] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[2] CHU Vaudois, Lausanne, Switzerland
[3] Univ Basel, Basel, Switzerland
[4] Inselspital Bern, CH-3010 Bern, Switzerland
[5] Kantonsspital Graubunden, Chur, Switzerland
[6] Kantonsspital St Gallen, St Gallen, Switzerland
[7] SAKK Coordinating Ctr, Bern, Switzerland
[8] Kantonsspitat St Gallen, Dept Med Oncol, St Gallen, Switzerland
[9] Univ Zurich, Zurich, Switzerland