Şingirik E, Çalışkan Ü, Cenik AG, Doğan N. Effects of verapamil, papaverine, sodium nitrite, and hydralazine on ethyl alcohol-induced contraction of the isolated human umbilical artery. Turk J Pediatr. 1989;31(2):145-149. doi:10.24953/turkjpediatr.1989.3838