1. Department of Anaesthesia and Intensive Care, Hospital Clínico Universitario de Valladolid, 47003 Valladolid, Spain
2. Cardiology Department, Hospital Clínico Universitario de Valladolid, 47003 Valladolid, Spain
3. Center for Biomedical Research in Cardiovascular Diseases Network (CIBERCV), 28029 Madrid, Spain
4. Cardiology Department, Instituto de Ciencias del Corazón (ICICOR), 47003 Valladolid, Spain
5. Department of Anaesthesia and Intensive Care, Clinical Hospital in Zamora, 49022 Zamora, Spain
6. Department of Anaesthesia and Intensive Care, Section Head of The Pain Unit, Son Espases University Hospital, 07120 Palma, Spain