1. Dipartimento di Medicina, Chirurgia e Farmacia, University of Sassari, Viale San Pietro, No. 43, 07100 Sassari, Italy
2. Baylor College of Medicine, One Baylor Plaza, Houston, TX 77023, USA
3. General Practitioner, Azienda Sanitaria Locale No. 1, 07100 Sassari, Italy