1. Anesthesiology Research Center, Shahid Beheshti University of Medical Sciences
2. Orthopedic Department, Orthopedic Surgery Research Center (OSRC), Sina Hospital, Tehran University of Medical Sciences, Tehran
3. Department of Orthopedic Surgery, Shahid Madani Hospital, Alborz University of Medical Sciences
4. Student Research Committee, Alborz University of Medical Sciences, Karaj, Iran