1. Department of Life, Health and Environmental Sciences; University of L'Aquila; L'Aquila Italy
2. Gynecology and Fertility Unit; San Salvatore Hospital; L'Aquila Italy
3. A.M.B.R.A; Palermo; Italy
4. IVF Unit; Cannizzaro Hospital; Catania Italy
5. Department of Experimental and Clinical Medicine; Division of Gynecology and Obstetrics; University of Pisa; Pisa Italy
6. Medical Liaison Office; Merck Serono S.p.A.; Rome Italy