Author Contributions: Dr D. Kim had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: H. Kim, Lim, S. Kim, J. Kim, Chang, Carroll, D. Kim.
Acquisition of data: H. Kim, Lim, J. Kim, Chang, D. Kim.
Analysis and interpretation of data: H. Kim, S. Kim, Carroll, D. Kim.
Drafting of the manuscript: H. Kim, Lim, S. Kim, Chang, Carroll, D. Kim.
Critical revision of the manuscript for important intellectual content: H. Kim, S. Kim, J. Kim, Carroll, D. Kim.
Statistical analysis: H. Kim, S. Kim, Carroll, D. Kim.
Obtained funding: D. Kim.
Administrative, technical, or material support: H. Kim, Lim, Chang, D. Kim.
Study supervision: J. Kim, D. Kim.
Financial Disclosures: Dr D. Kim reported receiving drug-trial related clinical research grants from Lilly, Organon, and Pfizer. Dr Carroll reported being a consultant to AstraZeneca, Becton Dickinson, Bristol-Myers Squibb, Cato Research, Cyberonics, DuPont, GlaxoSmithKline, Ives Laboratories, Janssen, Lilly, National Medical Laboratories, Novartis, Pfizer, Roche, Servier, Shire, Skila, and Wyeth; receiving research support from Janssen, Pfizer, and Wyeth; and receiving speaker honoraria from Abbott, Janssen, Lilly, Pfizer, and Wyeth. No other authors reported financial disclosures.
Funding/Support: This study was supported by grant 03-PJ10-PG13-GD01-0002 from the Korea Health Research and Development Project, Ministry of Health and Welfare, Republic of Korea.
Role of the Sponsor: The Ministry of Health and Welfare, Republic of Korea, did not have any involvement in the design of the study, nor was it involved in the data management and analysis, manuscript preparation, and review or approval of the manuscript.