Sildenafil inhibits duodenal contractility via activation of the NO-K+ channel pathway - Clemente, Cristiano Magalhães; Araújo, Paula Vasconcelos; Palheta Júnior, Raimundo C.; Ratts, Zoélia M. L.; Fernandes, Geórgia H.; Rola, Francisco Helio; Oliveira, Ricardo Brandt de; Santos, Armênio Aguiar dos; Magalhães, Pedro J. C. (Fundamental and Clinical Pharmacology, 2008)