title: Proposal: breast cancer and co-twin control.
authors.forename: N L
authors.initials: NL
authors.lastname: Segal
mesh_terms: D001943:Breast Neoplasms / Q000209:etiology*; D003020:Clothing / Q000009:adverse effects; D005260:Female; D006801:Humans; D012107:Research Design; D018433:Twin Studies as Topic