1. Department of Gastroenterology; Clinica Universidad de Navarra; Pamplona Spain
2. Department of Obstetrics and Gynecology; Clinica Universidad de Navarra; Pamplona Spain
3. Department of Obstetrics and Gynecology; Hospital Clinico San Cecilio; Granada Spain
4. Department of Pathology; Clinica Universidad de Navarra; Pamplona Spain