Remifentanil at induction of general anesthesia for cesarean section: Double blind, randomized clinical trial - Behdad, Shokoufeh; Ayatollahi, Vida; Harrazi, Hamid; Nazemian, Naderali; Heiranizadeh, Najemh; Baghianimoghadam, Behnam (Colombia Médica, 2013)