Ethical approval and consent to participate: This study was an analysis of existing data; thus it did not require approval by ethics review board. The data that was used in this study is the KNHANES and it has been getting an annual review and approval by Korea Centers for Disease Control (KCDC) Research Ethics Review Committee since 2007.
Consent for publication: Not applicable.
Availability of data and material: The KNHANES was openly available in https://knhanes.cdc.go.kr/knhanes/index.do by submitting written oath and data utilization plan.
Competing interest: The authors declare that they have no competing interest.
Funding: This study was supported by a faculty research grand of Yonsei Univesity College of Medicine (6-2018-0174 and 6-2017-0157).
Author Contributions: JH.J., EC.P., and SI.J. designed the study, collected the data, performed the statistical analysis, and wrote the manuscript. H.K. contributed to the discussion and reviewed and edited the manuscript. SI.J. is the guarantor of this work and as such, had full access to all of the data. SI.J. assumes responsibility for the integrity of the data and the accuracy of the data analysis.
Acknowledgements: We thank the Korean Centers for Disease Control (KCDC) which produced and provided national level survey data. We also thank those colleagues of the Institute of Health Services Research in Yonsei University that have given advice for important intellectual content.
Jae Hong Joo1,2; Eun-Cheol Park2,3; Hwijun Kim1,2; Doo Woong Lee1,2; Dong-Woo Choi1,2; Sung-In Jang2,3
1Department of Public Health, Graduate School, Yonsei University, Seoul, Republic of Korea
2Institute of Health Services Research, Yonsei University, Seoul, Republic of Korea
3Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
*Corresponding author: Sung-In Jang, MD, PhD
Department of Preventive Medicine & Institute of Health Services Research, Yonsei University College of Medicine
50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
Tel: +82-2-2228-1863; E-mail: [email protected]; Fax: +82-2-392-8133