[1] Lutheran Hosp, Orthopaed Res Labs, Cleveland Clin Hlth Syst, Cleveland, OH 44113 USA
[2] Emory Spine Ctr, Decatur, GA 30033 USA
[3] Case Western Reserve Univ, Sch Med, Cleveland, OH 44106 USA
[4] Ctr Adv Biomat & Tissue Engn, Philadelphia, PA 19104 USA