1. Department of Diagnostic and Biomedical Sciences and The University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas, USA.
2. Department of Oral and Maxillofacial Surgery, The University of Texas Health Science Center at Houston, School of Dentistry, Houston, Texas, USA.
3. Department of Biosciences and Rice University, Houston, Texas, USA.
4. Department of Bioengineering, Rice University, Houston, Texas, USA.