30 years German Dermatologic Cooperative Oncology Group (DeCOG). (22nd October 2021) - Garbe, Claus; Schadendorf, Dirk; Tilgen, Wolfgang; Gutzmer, Ralf; Berking, Carola; Mohr, Peter; Kaufmann, Roland; Breitbart, Eckhard; Weber, Christiane; Volkenandt, Matthias; Hauschild, Axel