Stepp Patricia C, Williams Ashley A, Chu Constance
Cartilage Restoration Center, Department of Orthopaedic Surgery, University of Pittsburgh, Kaufmann Medical Building, Suite 911, 3471 Fifth Avenue, Pittsburgh, PA 15213 USA.
HSS J. 2012 Feb;8(1):54-6. doi: 10.1007/s11420-011-9242-z. Epub 2012 Feb 23.