1 Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland, now at Charité Universitätsmedizin, Berlin, Germany.
2 Department of Radiation Oncology, Kantonsspital Winterthur, Winterthur, Switzerland.
3 SAKK Coordinating Center, Bern, Switzerland.
4 Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.