Sayın, Tamer2019-04-172019-04-170365-8104http://hdl.handle.net/20.500.12575/54973https://doi.org/10.1501/Tipfak_0000000188ustained long term benefit of sildenafil in primary pulmonary hypertension Sildenafilin primer pulmoner hipertansiyonda kalıcı uzun dönem yararlı etkisi