Xavier Rossello1, Francisca Caimari2. 1. Cardiology Department, Institut d'Investigació Sanitària Illes Balears, Hospital Universitari Son Espases, Palma 07120, Illes Balears, Spain; Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain; Facultad de Medicina, Universitat de les Illes Balears, Palma, Spain; Medical Statistics Department, London School of Hygiene & Tropical Medicine, London, UK. Electronic address: fjrossello@cnic.es. 2. Endocrinology and Diabetes Department, Hospital Juaneda Miramar, Palma de Mallorca, Spain.