1. Division of Clinical Medicine , School of Medicine and Population Health, , Sheffield, S10 2TN , United Kingdom
2. University of Sheffield , School of Medicine and Population Health, , Sheffield, S10 2TN , United Kingdom
3. California Pacific Medical Center, Research Institute , San Francisco, 94158, CA , United States
4. Department of Epidemiology & Biostatistics, University of California , San Francisco, 94158, CA , United States
5. Department of Medicine, University of California , San Francisco, 94158, CA , United States
6. Department of Orthopedic Surgery , Harvard Medical School, , Boston, 02215, MA , United States
7. Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center , Harvard Medical School, , Boston, 02215, MA , United States