Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>|Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>|Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>|Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>|Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>|Oral Cancer Research Institute, Yonsei University College of Dentistry, Seoul, Korea. kky1004@yumc.yonsei.ac.kr <kky1004@yumc.yonsei.ac.kr>