About the Authors

Eun Shil Cha

Affiliation Department of Preventive Medicine, College of Medicine, Korea University, Seoul, South Korea

Young-Ho Khang

Affiliations Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, South Korea, Institute of Health Policy and Management, Seoul National University College of Medicine, Seoul, South Korea

Won Jin Lee

leewj@korea.ac.kr

Affiliation Department of Preventive Medicine, College of Medicine, Korea University, Seoul, South Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WJL. Performed the experiments: ESC. Analyzed the data: ESC. Wrote the paper: ESC YHK WJL.