Intervertebral Disc Degeneration

• Investigating site BE01 — Brussels, Belgium
• Investigating site BE03 — Brussels, Belgium
• Investigating site BE05 — Brussels, Belgium
• Investigating site BE02 — Charleroi, Belgium

• Bone and Joint Clinic of Baton Rouge — Baton Rouge, Louisiana, United States

• Department of Neurosurgery, Kepler University Hospital — Linz, Upper Austria, Austria

• Fatih Sultan Mehmet Training and Research Hospital — Istanbul, Turkey (Türkiye)
• Fatih Sultan Mehmet Training and Research Hospital — Istanbul, Turkey (Türkiye)

• The Spine and Neurosurgery Center — Huntsville, Alabama, United States
• Spine Source — Beverly Hills, California, United States
• Pacific Spine Clinic — Escondido, California, United States
• UCSD Orthopaedic Surgery — San Diego, California, United States

• Zuyderland Medisch Centrum — Heerlen, Limburg, Netherlands

• Carolinas Neurosurgery and Spine — Charlotte, North Carolina, United States

Not specified

• Primary Healthcare Centre Dalby — Dalby, Sweden
• Primary Healthcare Centre Löddeköpinge — Löddeköpinge, Sweden
• Primary Healthcare Centre Capio Citykliniken Clemenstorget — Lund, Sweden
• Primary Healthcare Centre Laurentiikliniken — Lund, Sweden

• theMedicine — Wroclaw, Lower Silesian Voivodeship, Poland