Response to the Letter to the editor by Donnelly et al. regarding the article "Photobiomodulation therapy for the prevention of acute radiation dermatitis in head and neck cancer patients (DERMISHEAD trial)". (August 2021) - Robijns, Jolien; Lodewijckx, Joy; Claes, Stefan; Van Bever, Leen; Pannekoeke, Luc; Censabella, Sandrine; Bussé, Lore; Colson, Dora; Kaminski, Iris; Broux, Victoria; Puts, Sofie; Vanmechelen, Sofie; et al.