M M Sirufo1,2, L Ginaldi1,2, M De Martinis3,4. 1. Department of Life, Health and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi n. 1, 67100, L'Aquila, Italy. 2. Allergy and Clinical Immunology Unit, Center for the Diagnosis and Treatment of Osteoporosis, AUSL 04, Teramo, Italy. 3. Department of Life, Health and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi n. 1, 67100, L'Aquila, Italy. demartinis@cc.univaq.it. 4. Allergy and Clinical Immunology Unit, Center for the Diagnosis and Treatment of Osteoporosis, AUSL 04, Teramo, Italy. demartinis@cc.univaq.it.