title: Prevalence of hepatitis-associated antigen (HAA) in collagen disorders.
mesh_terms: D000936:Antigen-Antibody Complex; D003095:Collagen Diseases / Q000276:immunology*; D006511:Hepatitis B Antigens / Q000302:isolation & purification; D006801:Humans; D008875:Middle Aged; D014652:Vascular Diseases / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex; D006511:Hepatitis B Antigens