is a principal investigator in a clinical trial supported by Chong Kun Dang pharm. and is participating as an investigator in clinical trials supported by Eisai and Celltrion. Author contributions: Jin-Wook Kim: designed the research study, collected analyzed the data, and wrote the paper; Ingyoon Ha and Jung Wha Chung collected and analyzed the data and wrote the paper; Eun Sun Jang and Sook-Hyang Jeong analyzed the data and wrote the paper.
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