title: Limitation of a cross-sectional study.
authors.affiliation: Los Angeles, Calif.
authors.forename: R Christian
authors.initials: RC
authors.lastname: Solem
mesh_terms: D003481:Cuspid / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging*; D011859:Radiography; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*