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In page Alcohol and cardiovascular disease:
"Dr. Arthur Klatsky noted that the flaw pointed out by Fillmore existed in one of his early studies of alcohol consumption, but that his later studies illustrating a protective effect of moderate alcohol consumption did not contain this flaw. To overcome the inherent weaknesses of all epidemiological studies, even when properly conducted, he calls for a randomized trial in which some subjects are assigned to abstain while others are assigned to drink alcohol in moderation and the health of all is monitored for a period of years.[3]
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