Limited immunoexpression of fibroblast growth factor receptor 2 (FGFR2) in digital papillary adenocarcinoma: Comparison of FGFR2 immunohistochemistry between digital papillary adenocarcinoma, other sweat gland tumors and normal skin tissue. Issue 2 (18th November 2020) - Satake, Kosuke; Goto, Keisuke; Sugino, Takashi; Sasaki, Yosuke; Yoshikawa, Shusuke; Kiyohara, Yoshio