Secular trends in smoking during pregnancy according to income and ethnic group: Four Population-based perinatal surveys in a Brazilian City

Mariangela F. Silveira, Alicia Matijasevich, Ana Maria B Menezes, Bernardo L. Horta, Ina S. Santos, Aluisio J D Barros, Fernando C. Barros, Cesar G. Victora

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Medicine & Life Sciences