Diagnosis and treatment of basal cell carcinoma: European consensus-based interdisciplinary guidelines by Peris, K, Fargnoli, MC, Garbe, C, Kaufmann, R, Bastholt, L, Seguin, NB, Bataille, V, Marmol, VD, Dummer, R, Harwood, CA, Hauschild, A, Höller, C, Haedersdal, M, Malvehy, J, Middleton, MR, Morton, CA, Nagore, E, Stratigos, AJ, Szeimies, RM, Tagliaferri, L, Trakatelli, M, Zalaudek, I, Eggermont, A, Grob, JJ, European Dermatology Forum (EDF), the European Association of Dermato-Oncology (EADO) and the European Organization for Research and Treatment of Cancer (EORTC)