1. Service de Radiothérapie, Hôpital neuchâtelois, La Chaux-de-Fonds, Switzerland;
2. Medical Photobiology Group, Dept. Internal Medicine, Charité University Medicine, Berlin, Germany;
3. Department of Radiooncology and Radiotherapy, Klinikum rechts der Isar, Technische Universität München (TUM), München, Germany