Patient Preference

• LinkCare GmbH — Stuttgart, Baden-Wurttemberg, Germany
• Schmerz- und Palliativzentrum Rhein-Main — Wiesbaden, Hesse, Germany
• Schmerzpraxis Wiesbaden — Wiesbaden, Hesse, Germany

• McMaster University — Hamilton, Ontario, Canada

• Carme Hernández — Barcelona, Spain

• Philadelphia Veteran's Affairs Medical Center — Philadelphia, Pennsylvania, United States
• University of Pennsylvania Health System — Philadelphia, Pennsylvania, United States
• Fox Chase Cancer Center — Philadelphia, Pennsylvania, United States

• University of Tromsoe — Tromsø, Norway

• Memorial Sloan Kettering Cancer Center — New York, United States

• Zealand University Hospital — Køge, Region Sjælland, Denmark

• University college london hospitals — London, United Kingdom

Not specified

• Istituto Superiore di Osteopatia — Milan, MI, Italy