Cervical Disc Disease

• Department of Orthopaedics, J. Dietl Specialist Hospital — Krakow, Lesser Poland Voivodeship, Poland
• Department of Neurosurgery, Medical University of Warsaw — Warsaw, Masovian Voivodeship, Poland

• Zuyderland Medical Center — Maastricht, Limburg, Netherlands

Not specified

• Duly Health and Care — Naperville, Illinois, United States
• Columbia Orthopedic Group Research — Columbia, Missouri, United States
• Atlantic Brain and Spine — Wilmington, North Carolina, United States

• Carolina Neurosurgery and Spine Associates — Charlotte, North Carolina, United States
• Texas Back Institute — Plano, Texas, United States

• UC Irvine Medical Center — Orange, California, United States
• Hartford Healthcare Bone & Joint Institute — Hartford, Connecticut, United States
• MedStar Health Research Institute — Hyattsville, Maryland, United States
• NY Spine Institute — New York, United States

• Strenge Spine — Paducah, Kentucky, United States

• Hoag Orthopedics — Orange, California, United States
• The Spine Institute for Spine Restoration — Santa Monica, California, United States
• Spine Education and Research — Thornton, Colorado, United States
• Kennedy-White Orthopaedic Center — Sarasota, Florida, United States

• MORE Foundation — Phoenix, Arizona, United States
• Desert Institute for Spine Care — Scottsdale, Arizona, United States
• BEEL Medical — Laguna Hills, California, United States
• Orange County Neurosurgical Associates — Mission Viejo, California, United States

• Alazhar University, Assiut — Asyut, Egypt