1. NanoScience Technology Center, University of Central Florida, Orlando, Florida 32826, United States
2. Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida 32827, United States
3. Electron Microscopy Research Center, Korea Basic Science Institute (KBSI), Cheongju-si, Chungcheongbuk-do 28119, Republic of Korea