1. Department of Internal Medicine, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas 13083-887, Brazil
2. Department of Surgery, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas 13083-887, Brazil
3. Department of Nuclear Medicine, Clinic Hospital, State University of Campinas (UNICAMP), Campinas 13083-887, Brazil