1. Clinical Trials Unit, Bioaraba Health Research Institute, 01009 Vitoria-Gasteiz, Spain
2. Clinical Pharmacology Service, Marqués de Valdecilla University Hospital, 39008 Santander, Spain
3. Department of Physiology and Pharmacology, University of Cantabria, 39012 Santander, Spain
4. IDIVAL, 39004 Santander, Spain