1. Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
2. National Synchrotron Radiation Research Center, Hsinchu, Taiwan 30076, R.O.C.
3. Division of Plastic and Reconstructive Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan 11490, R.O.C.
4. Institute of Cellular and System Medicine, National Health Research Institutes, Miaoli, Taiwan 35053, R.O.C.