Case report: Insulinomatosis: description of four sporadic cases and review of the literature oleh Delmar Muniz Lourenço, Delmar Muniz Lourenço, Maria Lucia Corrêa-Giannella, Sheila Aparecida Coelho Siqueira, Marcia Nery, Flavio Galvão Ribeiro, Elizangela Pereira de Souza Quedas, Manoel de Souza Rocha, Ramon Marcelino do Nascimento, Maria Adelaide Albergaria Pereira