Analgesic Effects of Intrathecal Sufentanil Added to Lidocaine 5% in Elective Cesarean Section - Bakhshaei, Mohammad Hosein; Manuchehrian, Nahid; Khoshraftar, Ebrahim; Mohamadipour-Anvary, Hassan; Sanatkarfar, Mehdy (Acta Medica Iranica)