Letter: Maternal blood group A and pre-eclampsia.
D000017:ABO Blood-Group System; D005006:Ethnicity; D005260:Female; D006801:Humans; D011225:Pre-Eclampsia / Q000097:blood*; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System