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(Liz Hafalia/The San Francisco Chronicle via Getty Images) Maa is the former president of the San Francisco Marin Medical Society, which co-sponsored the proposal, along with major medical groups such as the American Heart Association and the American Lung Association

Differences in the proportion of contraband cigarettes observed between locations were assessed using a chi-square test in Open-Epi ( Results A total of 14,032 cigarette butts were collected in Peel and 12,918 cigarette butts were collected in Brantford, exceeding our sample size requirements

ISBN 0-396-06877-4

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