Hematoma, Subdural, Chronic

• Xuanwu Hospital Capital Medical University — Beijing, China
• Tianjin Medical University General Hospital — Tianjin, China

• Oulu University Hospital — Oulu, North Ostrobothnia, Finland
• Kuopio University Hospital — Kuopio, Northern Savonia, Finland
• Tampere University Hospital — Tampere, Pirkanmaa, Finland
• Turku University Hospital — Turku, Southwest Finland, Finland

• Cooper University Health Care — Camden, New Jersey, United States

• Clinica CES — Medellín, Antioquia, Colombia
• Hospital San Vicente Fundación — Medellín, Antioquia, Colombia
• Instituto Neurologico de Colombia — Medellín, Antioquia, Colombia

• Unfallkrankenhaus Berlin — Berlin, State of Berlin, Germany

• Amsterdam UMC — Amsterdam, Netherlands
• Erasmus MC — Rotterdam, Netherlands

• Amsterdam university medical Centers — Amsterdam, Netherlands

• University of Freiburg — Freiburg im Breisgau, Baden-Wurttemberg, Germany

• Academic Medical Center — Amsterdam, Netherlands

Not specified