An observational registry of carotid endarterectomy and carotid artery stenting in Brazil: study protocol - Joviliano, Edwaldo Edner; Yoshida, Winston Bonetti; Sobreira, Marcone Lima; Moura, Regina; Guillaumon, Ana Terezinha; Raymundo, Selma Regina De Oliveira; Miquelin, Daniel Gustavo; Hafner, Ludvig; Almeida, Marcelo José (JMIR Research Protocols, 2016)