title: Problems with study on secondhand smoke and children's tooth enamel.
authors.affiliation: Department of Clinical Epidemiology and Health Economics, School of Public Health, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan yamana-tky@umin.ac.jp.
authors.forename: Hayato
authors.initials: H
authors.lastname: Yamana
authors.affiliation: Department of Clinical Epidemiology and Health Economics, School of Public Health, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan.
authors.forename: Sachiko
authors.initials: S
authors.lastname: Ono
authors.affiliation: Department of Clinical Epidemiology and Health Economics, School of Public Health, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Yasunaga
mesh_terms: D003731:Dental Caries / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D012907:Smoking / Q000009:adverse effects*; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*; D014094:Tooth, Deciduous
chemical_list: D014028:Tobacco Smoke Pollution