Clin J Pain 2016 08;32(8):666-72
*The Alan Edwards Pain Management Unit, McGill University Health Centre, Montreal General Hospital, Montreal, QC, Canada †Department of Anesthesiology, Tehran University of Medical Sciences ‡Faculty for Medical Education ∥Department of Radiology, Shahid Beheshti University of Medical Sciences §Department of Physical Medicine and Rehabilitation, Iran University of Medical Sciences, Tehran, Iran.