1. Department of Biology; University of Pisa; Pisa; Italy
2. Servei de Medicina Nuclear; Hospital Vall d'Hebron; Barcelona; Spain
3. Operative Unit of Occupational Medicine; University Hospital; Pisa; Italy
4. Servei d'Endocrinologia; UDENTG, Hospital Universitari Josep Trueta; Girona; Spain
5. Department of Experimental and Clinical Medicine; Cisanello Hospital, University of Pisa; Italy