About the Authors

Li-Chung Chuang

Affiliations Department of Public Health & Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan, Department of Nursing, Cardinal Tien College of Healthcare & Management, I-Lan, Taiwan

Chung-Feng Kao

Affiliation Department of Public Health & Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan

Wei-Liang Shih

Affiliation Department of Public Health & Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan

Po-Hsiu Kuo

phkuo@ntu.edu.tw

Affiliations Department of Public Health & Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan, Research Center for Genes, Environment and Human Health, National Taiwan University, Taipei, Taiwan

Competing Interests

Co-author Po-Hsiu Kuo is a PLOS ONE Editorial Board member. His role as an Academic Editor for PLOS ONE does not alter his adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Acquisition of data: LCC CFK. Revised manuscript critically for important intellectual content: PHK LCC CFK WLS. Final approval of the version to be published: PHK. Conceived and designed the experiments: PHK LCC CFK WLS. Analyzed the data: LCC CFK WLS. Wrote the paper: LCC CFK.