Is there a relationship between birth month and maternal ABO blood type?
D000017:ABO Blood-Group System; D001787:Blood Group Incompatibility; D005260:Female; D005313:Fetal Death / Q000209:etiology; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D012621:Seasons; D013223:Statistics as Topic
D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System