1. South Texas Tissue Engineering Group, The University of Texas Health Science Center at San Antonio, Department of Oral and Maxillo-Facial Surgery, San Antonio, Texas 78284.
2. South Texas Tissue Engineering Group, The University of Texas Health Science Center at San Antonio, Department of Orthopaedics, San Antonio, Texas 78284.
3. South Texas Tissue Engineering Group, The University of Texas Health Science Center at San Antonio, third-year medical student, San Antonio, Texas 78284.