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Physician identification of smoking as a risk factor in the NAPS2-CV or NAPS2-AS studies when compared with NAPS2 original study. Only centers that participated in the NAPS2 original study and either one or both of the NAPS2-CV or NAPS2-AS studies and in whom the enrolling physician identified smoking as a risk factor in <70% ever smokers in the NAPS2 original study were included in this analysis
