1. Department of Bioengineering, University of California San Diego, La Jolla, CA 92093
2. Sanford Consortium for Regenerative Medicine, La Jolla, CA 92037
3. Department of Oral Pathology, Federal University of Rio Grande do Sul
4. Department of Physics and Engineering, West Chester University of Pennsylvania, West Chester, PA 19383
5. Department of Head and Neck Surgery, Santa Rita Hospital, Santa Casa de Misericórdia de Porto, Alegre
6. Deparment of Morphological Sciences, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul, Porto Alegre, RS 90035, Brazil