1. Biomaterials Group, Faculty of Biomedical Engineering (Center of Excellence), Amirkabir University of Technology, Tehran, I. R. Iran
2. Iranian Tissue Bank & Research Center, Tehran University of Medical Sciences, Tehran, I. R. Iran
3. Dental Materials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, I. R. Iran
4. Department of Developmental Sciences, Marquette University School of Dentistry, Milwaukee, WI, USA