1. Department of Anesthesiology; American University of Beirut Medical Center; Beirut Lebanon
2. Department of Physical Medicine and Rehabilitation; Penn Spine Center, University of Pennsylvania; Philadelphia Pennsylvania
3. Department of Radiology; Mayo Clinic; Rochester Minnesota
4. Rehabilitation Institute of Chicago, Northwestern University School of Medicine; Chicago Illinois
5. Department of Health Sciences Research; Division of Biomedical Statistics and Informatics; Mayo Clinic; Rochester Minnesota
6. Department of Orthopedic Surgery; Stanford University; Stanford California
7. Department of Physical Medicine and Rehabilitation; Mayo Clinic; Rochester Minnesota USA