title: [An epidemiologic study on the effect of the stainless steel ring IUD in rural women of 12 provinces and municipalities in China. The Epidemiologic Collaborating Group of the Effect of IUD].
mesh_terms: D000328:Adult; D001499:Bayes Theorem; D002681:China; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects; D012189:Retrospective Studies; D012424:Rural Population; D013232:Steel; D011795:Surveys and Questionnaires
chemical_list: D013232:Steel