1. Andrology Unit; Department of Life, Health and Environment Sciences; University of L'Aquila; L'Aquila; Italy
2. Centre for Clinical Research; San Raffaele Sulmona; Sulmona; Italy
3. Laboratory of Seminology and Immunology of Human Reproduction; Department of Medical Pathophysiology; University of Rome, ‘La Sapienza’; Rome; Italy
4. Epidemiology; Department of Life, Health and Environment Sciences; University of L'Aquila; L'Aquila; Italy