1. Department of Orthopaedics and Traumatology The University of Hong Kong Pokfulam China
2. Medical Research Center Oulu Oulu University Hospital and University of Oulu Oulu Finland
3. Center for Life Course Health Research University of Oulu Oulu Finland
4. Finnish Institute of Occupational Health Oulu Finland
5. Department of Orthopedic Surgery Rush University Medical Center Chicago Illinois USA
6. International Spine Research Innovation Initiative Rush University Medical Center Chicago Illinois USA