1. Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
2. Mailman School of Public Health, Columbia University, New York, New York, USA.
3. Washington University School of Medicine in St Louis, St Louis, Missouri, USA.
4. Department of Orthopedic Surgery, Columbia University, New York, New York, USA.
5. Department of Medicine, Albany Medical College, Albany, New York, USA.