[1] Natl & Kapodistrian Univ Athens, Attikon Univ Hosp, Sch Med, Dept Urol 3, Athens 12462, Greece
[2] Univ Ioannina, Fac Med, Sch Hlth Sci, Dept Urol,Lab Spermatol, Ioannina 45110, Greece
[3] Royal Cornwall Hosp, Dept Obstet & Gynecol, Truro TR1 3LJ, England
[4] Natl & Kapodistrian Univ Athens, Med Sch, Athens 12462, Greece
[5] Univ Ioannina, Fac Med, Sch Hlth Sci, Dept Obstet & Gynaecol, Ioannina 45110, Greece
[6] Aristotle Univ Thessaloniki, Fac Med, Sch Hlth Sci, Dept Urol, Thessaloniki 54124, Greece
[7] Natl & Kapodistrian Univ Athens, Attikon Univ Hosp, Sch Med, Dept Obstet & Gynecol 3, Athens 12462, Greece
[8] St Georges Univ London, Mol & Clin Sci Res Inst, Vasc Biol, London SW17 0RE, England