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Wang P, Zhang W, Yang R, et al

By restricting the analyses to cohort studies, the goal was to minimize bias often present in case-control studies

Ethical approval The MEC study was approved by the University of Hawaii and University of Southern California Institutional Review Boards

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Enter Leo Burnett The filtered cigarette had been on the U.S

Participants were recruited via advertisements on the Craigslist and Kijiji websites (Appendix 3)