1 Virgen Macarena University Hospital, Endoscopy Division, Sevilla, Spain.
2 Hospital Vithas Nisa Sevilla, Endoscopy Unit, Sevilla, Spain.
3 Virgen Macarena University Hospital, Pathology Division, Sevilla, Spain.
4 Virgen Macarena University Hospital, Gastroenterology Division, Sevilla, Spain.
5 University of Seville, Department of Medicine, Seville, Spain.
6 Virgen Macarena University Hospital; Unidad Clínica de Enfermedades Infecciosas, Microbiología y Medicina Preventiva; Universidad de Sevilla and Instituto de Biomedicina de Sevilla, Seville, Spain.