1. Department of Internal Medicine and Emergency Medicine; Infanta Cristina University Hospital; Madrid Spain
2. Department of Medicine; Complutense University; Madrid Spain
3. Section of Pulmonary and Critical Care Medicine; South Texas Veterans Health Care System and University of Texas Health Science Center; San Antonio Texas
4. Division of Hospital Medicine; University of Texas School of Medicine in San Antonio; Texas
5. Department of Cardiology; Infanta Cristina University Hospital; Madrid Spain
6. Department of Biochemistry; Infanta Cristina University Hospital; Madrid Spain