1. Rothman Institute at Thomas Jefferson University, 925 Chestnut Street, Philadelphia, Pennsylvania 19107, USA.
2. Washington University in St Louis, One Barnes-Jewish Hospital Plaza, Suite 11300, West Pavillion, St Louis, Missouri 63110, USA.
3. Center for Joint Preservation and Reconstruction, Sinai Hospital of Baltimore, 2401 West Belvedere Avenue, Baltimore, Maryland 21215, USA.