Response to: Reproducibility of the external surface position in left‐breast DIBH radiotherapy with spirometer‐based monitoring: methodological mistake. (8th July 2014) - Fassi, Aurora; Ivaldi, Giovanni B.; Meaglia, Ilaria; Porcu, Patrizia; de Fatis, Paola Tabarelli; Liotta, Marco; Riboldi, Marco; Baroni, Guido