1. Department of Surgery and Medical-Surgical Specialties, School of Medicine and Dentistry, University of Santiago de Compostela, Santiago de Compostela, Galicia, Spain
2. Fundación IDIS, Lucus Augusti University Hospital, Galician Health Service, Lugo, Spain
3. Primary Care Clinics, EOXI Lugo, Cervo e Monforte de Lemos, Galician Health Service, Lugo, Spain
4. Ciudad Real General University Hospital, Castilla-La Mancha Health Service, Ciudad Real, Castilla-La Mancha, Spain
5. Private Practice, Lugo, Spain
6. Department of Surgery and Medical-Surgical Specialties, School of Medicine and Health Sciences, University of Oviedo, Oviedo, Asturias, Spain