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