1. Center for Proton Therapy; Paul Scherrer Institute; Villigen PSI Switzerland
2. Department of Radiation Oncology, Universitätspital Zürich; University of Zurich; Switzerland
3. Department of Radiation Oncology; Inselspital; University of Bern; Switzerland
4. Department of Radiation Oncology; Geneva University Hospital; Geneva Switzerland
5. Department of Anesthesia; University Children's Hospital Zurich; Switzerland
6. Department of Oncology; University Children's Hospital Zurich; Switzerland