1. Division of Coloproctology, Department of General and Digestive Surgery Hospital Universitario Ramón y Cajal Madrid Spain
2. Division of Coloproctology Hospital Universitario Central de Asturias Oviedo Spain
3. Colorectal Surgery Unit Hospital Universitario de Donostia San Sebastián Spain
4. Colorectal Division Hospital Universitario La Paz Madrid Spain
5. Colorectal Division Hospital Univseristario Cabueñes Gijón Spain
6. Department of Colorectal Surgery, Hospital Universitari Vall d'Hebron Universitat Autonoma de Barcelona Barcelona Spain
7. Division of Coloproctology Hospital Universitario 12 de Octubre Madrid Spain
8. Division of Coloproctology Hospital Universitario Puerta de Hierro Majadahonda Spain
9. Division of Coloproctology Complejo Hospitalario Universitario A Coruña A Coruña Spain
10. Division of Coloproctology Hospital Universitario Burgos Burgos Spain
11. Division of Coloproctology Hospital Universitario de Getafe Getafe Spain
12. Division of Coloproctology Hospital Universitario Gregorio Marañón Madrid Spain
13. Unit of Coloproctology Hospital Universitario Rey Juan Carlos Móstoles Spain
14. Division of Coloproctology Hospital Clínico Universitario de Valencia Valencia Spain
15. Unit of Coloproctology Hospital Universitario La Princesa Madrid Spain
16. Division of Coloproctology Hospital Universitario de Badajoz Badajoz Spain