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In page Chang Kee-ryo:
"In 1938, he worked as a lecturer in Keijō's entire surgery. In order to keep his promise to God that he would become a doctor who helped the poor who did not receive medical care due to lack of money at the time of the most rigorous and competitive entrance exam of the medical school. In September 1940, he obtained his Ph.D. in Nagoya University in bacteriological studies on appendicitis.[citation needed]
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