Inter- and intra-patient heterogeneity of PD-L1 expression in metastatic melanomas: A retrospective study - Giavina-Bianchi, Mara; Sotto, Mirian Nacagami; Giavina-Bianchi, Pedro; Munhoz, Rodrigo; Festa Neto, Cyro; Kalil, Jorge (Australasian Journal of Dermatology, 2021)