title: [REGISTER OF TWINS. PRELIMINARY REPORT].
mesh_terms: D000397:Air Pollution; D001699:Biometry; D004200:Diseases in Twins; D006801:Humans; D008499:Medical Records; D012907:Smoking; D013223:Statistics as Topic; D013548:Sweden; D014427:Twins
keywords: AIR POLLUTION; DISEASES IN TWINS; MEDICAL RECORDS; SMOKING; STATISTICS; SWEDEN; TWINS
vernacular_title: TVILLINGREGISTRET. PRELIMINAERT MEDDELANDE.