Acral lentiginous melanoma and mucosal melanoma expressed less programmed‐death 1 ligand than cutaneous melanoma: a retrospective study of 73 Japanese melanoma patients - Nakamura, Y.; Ishitsuka, Y.; Tanaka, R.; Okiyama, N.; Saito, A.; Watanabe, R.; Fujisawa, Y. (Journal of the European Academy of Dermatology and Venereology, 2019)