title: Rheumatoid arthritis XII: epidemiology and genetics.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000235:genetics / Q000276:immunology; D004200:Diseases in Twins; D004777:Environment; D005260:Female; D006680:HLA Antigens / Q000032:analysis; D006566:Herpesviridae Infections / Q000150:complications; D004854:Herpesvirus 4, Human; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006801:Humans; D008297:Male; D011247:Pregnancy; D044469:Racial Groups; D012737:Sex Factors; D013997:Time Factors; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D006680:HLA Antigens; D000949:Histocompatibility Antigens Class II