1. Department of Anesthesia; Hospital Universitario de Guadalajara; Guadalajara Spain
2. Department of Surgery; Hospital 12 de Octubre; Madrid Spain
3. Department of Internal Medical; Research Unit, Hospital Universitario de Guadalajara. Universidad de Alcalá; Guadalajara Spain
4. Department of Health Inspection; Hospital Universitario de Guadalajara. Universidad de Alcalá; Guadalajara Spain