[1] Univ Connecticut, Ctr Hlth, Dept Med, Farmington, CT 06030 USA
[2] Univ Connecticut, Ctr Hlth, Musculoskeletal Inst, Farmington, CT 06030 USA
[3] Yale Univ, Sch Med, Dept Orthopaed, New Haven, CT 06510 USA
[4] Univ Penn, Sch Med, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA