title: Persistent finger-sucking in twins.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001789:Blood Group Antigens; D002648:Child; D004200:Diseases in Twins; D005260:Female; D005386:Fingersucking / Q000235:genetics*; D006801:Humans; D008297:Male; D012737:Sex Factors
chemical_list: D001789:Blood Group Antigens