1. Institute
of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330-714, South Korea
2. Department
of Nanobiomedical Science and BK21 PLUS NBM Global Research Center
for Regenerative Medicine, Dankook University, Cheonan 330-714, South Korea
3. Glass
Research Department, National Research Center, Cairo, Egypt
4. Department
of Biomaterials Science, School of Dentistry, Dankook University, Cheonan 330-714, South Korea