Nasrolahei S, Hoseini SA, Hosseini SA, Hosseini SNK, Hosseini SS, Lotfi PM. Effect of nifedipine with and without sildenafil citrate for the management of preterm labor in pregnant women: A randomized clinical trial. IJRM [Internet]. 2023Jun.10 [cited 2024Jul.18];21(5):379–386. Available from: https://knepublishing.com/index.php/ijrm/article/view/13471