1. Division of Gastroenterology (Gastrocentro), University of Campinas (Unicamp), Campinas, SP, Brazil
2. Department of Internal Medicine, University of Campinas (Unicamp), Campinas, SP, Brazil
3. Department of Pathology, University of Campinas (Unicamp), Campinas, SP, Brazil
4. Department of Neurology, University of Campinas (Unicamp), Campinas, SP, Brazil