1. 1 Department of Pain Medicine, Multidisciplinary Pain Center, VITAZ, Sint-Niklaas, Belgium
2. 2 Department of Anesthesiology, Philippine General Hospital, University of Philippines, Philippines
3. 3 Department of Physical Medicine and Rehabilitation, University Health Network, University of Toronto, Toronto, Ontario, Canada
4. 4 Department of Anesthesiology and Intensive Care Medicine, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
5. 5 Department of Anesthesiology and Pain Medicine, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada
6. 6 MLIS Library & Information Services, University Health Network, Toronto, Ontario, Canada