Author Contributions: Dr Jee 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: Jee, Ohrr, Samet.
Acquisition of data: Jee, Yun.
Analysis and interpretation of data: Jee, Sull,
Drafting of the manuscript: Jee, Yun, Ji, Samet.
Critical revision of the manuscript for important
intellectual content: Ohrr, Sull.
Statistical analysis: Jee, Sull, Yun, Ji.
Obtained funding: Samet.
Study supervision: Ohrr, Samet.
Funding/Support: This study was funded by grant
1R03 CA94771-02 from the National Cancer Institute.
Role of the Sponsor: The funding source had
no role in the design and conduct of the study, in the collection, analysis,
and interpretation of the data, or in the preparation, review, or approval
of the manuscript.
Acknowledgment: We thank the staff of the Korean
National Health Insurance Corp. We also thank Walter Willett, MD, DrPH, Frederick
Brancati, MD, MHS, and Elizabeth Platz, ScD, MPH, for their helpful comments
and Charlotte Gerczak, MLA, for editorial assistance.