Corvasce, Antonio, Giuseppe Albino, Teresa Leonetti, Agnese Buonomo, and Ettore Marucco. “Once-a-Day Tadalafil Administration Improves the Spermogram Parameters in Fertile Patients”. Archivio Italiano di Urologia e Andrologia 87, no. 3 (September 30, 2015): 210-213. Accessed March 30, 2020. https://pagepressjournals.org/index.php/aiua/article/view/aiua.2015.3.210.