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Contributors H-JC, and HSK: designed the research and wrote the manuscript; Y-JK, J-OJ, MSO, K-WB, and JRL: performed the immunohistochemical analysis, collected and analysed data; HKJ: analysed and confirmed immunohistochemical data; YHC, W-JK, and WHL: supervised the final manuscript.
Funding This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (2008-0062611).
Competing interests None.
Ethics approval Not applicable as purchasing commercially available tissue microarray.
Provenance and peer review Not commissioned; externally peer reviewed.