1 Department of Orthopaedic Surgery, College of Physicians and Surgeons, Columbia University, 650 West 168th Street, Rm 1412, New York, NY 10032. cc3391@columbia.edu. scott.a.j.thompson@gmail.com. fl127@columbia.edu.
2 Department of Pathology, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, Vanderbilt Clinic 14-215, New York, NY 10032. fr116@columbia.edu.