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According to a study by the National Institutes of Health, all the cigarette brands studied tested positive for tobacco mosaic, while only 53% of those viruses were viable

[269] [270] Education [edit] On January 31, 2005, Duff began taking classes at Harvard University as part of the Harvard Extension School, one of the 12 schools in the Harvard University system

Yet, the only enduring mark he has left on the history of American medicine is his embarrassing, obdurate, messianic insistence, in the face of all factual evidence to the contrary, on the curative powers of heroic depletion therapy [bloodletting and purging]