1. Institute of Cardiology, “G. d'Annunzio” University, Chieti, Italy
2. C.N.R. Institute of Clinical Physiology, Pisa, Italy
3. Dipartimento di Endocrinologia e Malattie del Metabolismo, Azienda Ospedaliera Universitaria Pisana, Pisa, Italy
4. Department of Preventive Cardiology, Aalborg Sygehus, Århus University Hospitals, Århus, Denmark