Gastroenterology Department, Hospital Severo Ochoa, Av. de Orellana, s/n, 28911, Leganés, Madrid, Spain. Internal Medicine Department, Hospital Rey Juan Carlos, c/Gladiolo sn, 28933, Móstoles, Madrid, Spain. Gastroenterology Department, Hospital Severo Ochoa, Av. de Orellana, s/n, 28911, Leganés, Madrid, Spain. lrabagot@gmail.com. Gastroenterology Department, Hospital San Rafael, C/ Serrano 199, 28016, Madrid, Spain. lrabagot@gmail.com. Department of Preventive Medicine, Fundación Jiménez Díaz, Madrid, Spain. Surgical Department, Hospital Severo Ochoa, Av. de Orellana, s/n, 28911, Leganés, Madrid, Spain.