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Contributors Study design: HSP, MJC, HL, WSM, and KYJ. Data acquisition: HSP, KMK, JSB, and KYJ. Immunohistochemical staining: KMK and JSB. Data Interpretation: HSP, MJC, HL, WSM, and KYJ. Writing and final approval of manuscript: HSP, KMK, JSB, MJC, HL, WSM, and KYJ.
Funding This work was supported by research funds of Chonbuk National University in 2012, and by the National Research Foundation of Korea Grant funded by the Korean Government (No. 2012-0009320).
Competing interests None.
Patient consent Obtained.
Ethics approval This study obtained Chonbuk National University Institutional Review Board approval (IRB No., CUH 2013-04-026-001).
Provenance and peer review Not commissioned; externally peer reviewed.