Radiation dose-painting with protons vs. photons for head-and-neck cancer. - Håkansson, Katrin; Smulders, Bob; Specht, Lena; Zhu, Mingyao; Friborg, Jeppe; Rasmussen, Jacob H.; Bentzen, Søren M.; Vogelius, Ivan R. (Acta Oncologica, 2020)