He said it also involves Catholic University Hospital and Chonnam National University Hospital in the southern city of Gwangju.
The three hospitals have recruited about 540 people for clinical tests, he said, adding they would receive a total of one billion won (1.
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08 million dollars) from the US company for the research.
Jang said the "basic research" aimed at identifying what harmful factors affect smokers compared to non-smokers.
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An anti-smoking group urged the hospitals to withdraw from what it called "unethical" research.
"The World Health Organisation suggests hospitals should not receive research