1. Transplant Immunology Group; Clinical Immunology Department; Hospital General Universitario Gregorio Marañon; Madrid Spain
2. Cardiology Department; Hospital General Universitario Gregorio Marañon; Madrid Spain
3. Anesthesiology Department; Hospital General Universitario Gregorio Marañon; Madrid Spain
4. Microbiology Department; Hospital General Universitario Gregorio Marañon; Madrid Spain
5. Transfusion Center of the Community of Madrid; Madrid Spain