1. Coronary Care Unit, Department of Cardiology; Hospital Universitario de Canarias, Ctra. La Cuesta - Taco. Ofra s/n. S, Cristóbal de La Laguna; E-38320 Sta. Cruz de Tenerife Spain
2. Department of Physiology, School of Medicine; University of La Laguna; Tenerife Canary Islands Spain