1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802,
3. Department of Surgery, College of Medicine, The Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey, PA 17033
4. Arrow International, P.O. Box 6306, Reading, PA 19610