title: A survey of immunohematologic proficiency among 131 clinical laboratories in Pennsylvania.
mesh_terms: D001789:Blood Group Antigens / Q000032:analysis*; D006801:Humans; D007106:Immune Sera; D007753:Laboratories / Q000592:standards*; D008722:Methods; D010067:Ownership; D010414:Pennsylvania; D012204:Rh-Hr Blood-Group System / Q000032:analysis*
chemical_list: D001789:Blood Group Antigens; D007106:Immune Sera; D012204:Rh-Hr Blood-Group System