Author Contribution
M.N. was principle investigator of this trial. He wrote the protocol, examined the local patients and wrote the manuscript. S.M. and L.M. were responsible for the collection of data and for entering them to the database. M.G.H. irradiated, examined and documented the Regensburg patients. P.M. and J.F. supervised the patients’ radiotherapy procedures. S.G. was responsible for the statistical issues in the protocol and the final evaluation of the data. C.R. as the former department head and M.H. as the present department head supervised the trial. All authors have read, corrected and approved the final manuscript.