Author Contributions: Dr Yim 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: Yim.
Acquisition of data: Kang, Lee, Yoon, Cho.
Analysis and interpretation of data: Kang,
Han, Shim, Yim.
Drafting of the manuscript: Kang, Lee.
Critical revision of the manuscript for important
intellectual content: Yoon, Cho, Han, Shim, Yim.
Statistical analysis: Kang.
Administrative, technical, or material support:
Lee, Yoon, Cho, Han, Yim.
Study supervision: Han, Shim, Yim.
Financial Disclosures: None reported.
Funding/Support: This work was supported by
grant 05-2004-005-0 from the Seoul National University College of Medicine
Research Fund (Seoul, Republic of Korea). The purified protein derivative
assay kits were donated by Korean Institute of Tuberculosis (Seoul, Republic
of Korea) and the QuantiFERON-TB Gold assay kits were donated by Woongbee
Meditech (Seoul, Republic of Korea).
Role of the Sponsor: The Seoul National University
College of Medicine Research Fund had no involvement in the design and conduct
of the study; in the collection, management, analysis, and interpretation
of the data; or in the preparation, review or approval of the manuscript.
Acknowledgment: We thank the numerous individuals
who volunteered to participate in this study. We also acknowledge the insightful
contributions of Seung-Sik Hwang, MD, Young Whan Kim, MD, Chul-Gyu Yoo, MD,
Sang Min Lee, MD, Sang Won Um, MD, Chang-Hoon Lee, MD, and Eun Kyoung Lee,