Affiliation: | 1. Department of Medicine, Federal University of Rio Grande do Norte, Natal, Brazil;2. Department of Medicine, University of Buenos Aires, Buenos Aires, Argentina;3. Department of Medicine, Federal University of Juiz de Fora, Juiz de Fora, Brazil;4. Department of Medicine, Federal University of Pelotas, Pelotas, Brazil;5. Hospital de Especialidades Santa Margarita, Portoviejo, Ecuador |