Comment on "Objective assessment in digital images of skin erythema caused by radiotherapy" [Med. Phys. 42, 5568–5577 (2015)]. Issue 5 (3rd May 2016) - Carrara, Mauro; Giandini, Tommaso; Pariani, Chiara; Pignoli, Emanuele; Rancati, Tiziana; Valdagni, Riccardo; De Santis, Carmen; Lozza, Laura