1. EBPI-UWZH Musculoskeletal Epidemiology Research Group, University of Zurich and Balgrist University Hospital, Zurich, Switzerland
2. Epidemiology, Biostatistics and Prevention Institute (EBPI), University of Zurich, Zurich, Switzerland
3. University Spine Center Zurich (UWZH), Balgrist University Hospital and University of Zurich, Zurich, Switzerland
4. Department of Science in Korean Medicine, College of Korean Medicine, Graduate School, Kyung Hee University, Seoul, Korea
5. Independent Researcher, Sacramento, California, United States
6. Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea
7. Division of Biostatistics, Department of Public Health Sciences, University of California, Davis, California, United States