About the Authors

Jun Ho Cho


Affiliation Department of Public Health Administration, Hanyang Women’s University, 17 Haeng-Dong Sungdong-Ku, Seoul 133–793, Republic of Korea

Samuel Y. Paik

Affiliation Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JHC. Performed the experiments: JHC. Analyzed the data: JHC SYP. Wrote the paper: JHC SYP. Interpretation of data, critical revision of the manuscript for important intellectual content, editing the manuscript: SYP.