Environment and Treatment The location of the study will be the treatment suite of the University of Alberta Hospital Pain Centre. At least one anesthesiologist will be on site and a post anesthesia recovery nurse. A peripheral intravenous cannula will be inserted into each participant and intravenous normal saline 250 cc will be commenced to run over one hour in conjunction with the treatments to flush the intravenous line. The patient will be placed on a stretcher and made comfortable within the privacy of the suite. The lighting may be dimmed but not to a level that would compromise monitoring and safety. Noise will be kept to a minimum.