1. Weill Cornell Medical College, New York Presbyterian Hospital, New York, NY, USA
2. UNIMEC, Barranquilla, Colombia
3. Centre Hospitalier Régional Universitaire de Lille, Lille, France
4. The University of Washington–Seattle, Seattle, WA, USA
5. Seoul St Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
6. Hospital Universitario Ramón y Cajal, Madrid, Spain
7. Spines WA, Mount Medical Centre, Perth, Western Australia, Australia
8. Razi Spine Clinic, Amman, Jordan