title: The perinatal mortality of twins at Ramathibodi Hospital: 1981-1984.
mesh_terms: D004200:Diseases in Twins; D005260:Female; D005313:Fetal Death / Q000453:epidemiology*; D006801:Humans; D007226:Infant Mortality; D011247:Pregnancy; D012189:Retrospective Studies; D013785:Thailand