1. Rio Hortega University Hospital, Valladolid, Spain
2. Hospital General de Granollers, Granollers, Spain
3. General University Hospital of Alicante, Alacant, Spain
4. Hospital Santos Reyes, Aranda de Duero, Spain
5. Navarra Hospital Complex – Navarra Hospital, Pamplona, Spain
6. General University Hospital of Alicantet, Alacant, Spain
7. Hospital Universitario Rey Juan Carlos, Madrid, Spain