Sahlgrenska University Hospital, Gothenburg, Sweden
Jokilaakson Terveys Oy, Jämsä, Finland
Turku university hospital, Turku, Finland
The Mount Sinai Hospital, New York, New York, United States
Holy Name Medical Center, Teaneck, New Jersey, United States
Weill Cornell Medical College/New York Presbyterian Hospital, New York, New York, United States
Panorama Orthopedics and Spine Center, Golden, Colorado, United States
OrthoCarolina Research Institute, Charlotte, North Carolina, United States
Rothman Institute, Philadelphia, Pennsylvania, United States
Klinikum Augsburg, Augsburg, Germany
Uniklinik Balgrist, Zürich, Switzerland
The Pennine Acute Hospital NHS Trust, Manchester, United Kingdom
Greenslopes Private Hospital, Greenslopes, Queensland, Australia
OLV Ziekenhuis Department Neurosurgery, Aalst, Belgium
Vernon Jubile Hospital, Vernon, British Columbia, Canada
Klinikum Dortmund gGmbH, Dortmund, Germany
University Hospital of Wales, Llandough Hospital, Penarth, Wales, United Kingdom
Sygehus Vejle, Vejle, Denmark
Kyunghee Univ. Hospital, Seoul, Korea, Republic of
Korea Univ. Hospital, Seoul, Korea, Republic of
Samsung Medical Center, Seoul, Korea, Republic of