1. Rio Hortega University Hospital, Valladolid, Spain
2. Hospital Universitario Rey Juan Carlos, Madrid, Spain
3. Navarra Hospital Complex – Navarra Hospital, Pamplona, Spain
4. Hospital General Universitario de Toledo, Toledo, Spain
5. Hospital General de Granollers, Granollers, Spain
6. Complejo Asistencial Universitario de Salamanca, Salamanca, Spain