Increase of atypical fibroxanthoma and pleomorphic dermal sarcoma: a retrospective analysis of four German skin cancer centers. - Kuntz T; Siebdrath J; Hofmann SC; Baltaci M; Schaller J; Hellmich M; von Goltzheim LS; Assaf C; Oellig F; Michalowitz AL; Helbig D; Kreuter A (Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG, 2022)