Cheon YK, Cho YD, Moon JH, Im HH, Jung Y, Lee JS, Lee MS, Shim CS. Effects of vardenafil, a phosphodiesterase type-5 inhibitor, on sphincter of Oddi motility in patients with suspected biliary sphincter of Oddi dysfunction. Gastrointest Endosc. 2009 May;69(6):1111–6. doi: 10.1016/j.gie.2008.07.014. PMID: 19243765.
Effects of vardenafil, a phosphodiesterase type-5 inhibitor, on sphincter of Oddi motility in patients with suspected biliary sphincter of Oddi dysfunction