1. Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612, USA
2. International Spine Research and Innovation Initiative, Rush University Medical Center, Chicago, IL 60612, USA
3. Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong SAR, China
4. Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, IL 60612, USA
5. Department of Internal Medicine, Rush University Medical Center, Chicago, IL 60612, USA
6. Department of Twin Research, King’s College London, London WC2R 2LS, UK