Effect of sildenafil on clitoral blood flow and sexual response in postmenopausal women with orgasmic dysfunction - Cavalcanti, Ana L.; Bagnoli, Vicente Renato; Fonseca, Angela M.; Pastore, Roberto A.; Cardoso, Eduardo B.; Paixão, Jucilene S.; Soares Jr., José M.; Saad, Fabrício; Baracat, Edmund Chada (International Journal of Gynecology & Obstetrics, 2008)