Research Article
Effect of Adding Ketamine to Pethidine on Postoperative Pain in Patients undergoing Major Abdominal Operations: A Double Blind Randomized Controlled Trial
A. Nourozi,
H. Talebi,
S. Fateh,
A. Mohammadzadeh,
P. Eghtesadi-Araghi,
Z. Ahmadi,
A. Savarabadi and A. Mohebbi