Attributes and risk factors of positive margins on 864 excisions of basal cell carcinomas: a single-center retrospective study - Bueno Filho, Roberto; Fantini, Bruno de Carvalho; Santos, Cecília Anatriello dos; Melo, Rafael V. G.; Rosan, Isadora; Chahud, Fernando; Souza, Cacilda da Silva (Journal of Dermatological Treatment, 2020)