1. Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada H3A 2B2
2. Boomershine Wellness Centers and Division of Rheumatology and Immunology, Vanderbilt University, Nashville, TN, USA
3. McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA
4. Section of Rheumatology, Department of Medicine, University of Illionois College of Medicine at Peoria, Peoria, IL 61656, USA