1 Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy.
2 Statistics Section, Local Health Authority of the Province of L'Aquila, L'Aquila, Italy.
3 Division of Endocrine Surgery, "AgostinoGemelli" School of Medicine, University Foundation Polyclinic, Catholic University of the Sacred Heart, Rome, Italy.
4 Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy. Electronic address: giovambattista.desideri@univaq.it.