1. Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, Singapore 138669, Singapore
2. National Institute of Aerospace, 100 Exploration Way, Hampton, Virginia 23666, United States
3. Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, Virginia 23681, United States
4. Department of Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
5. Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois 60612, United States
6. Department of Human and Culture Convergence Technology R&BD Group, Korea Institute of Industrial Technology, Ansan-si, Gyeonggi-do 426-910, Republic of Korea