Autoantibodies/immunology; Autoimmune Diseases/chemically induced; Cardiopulmonary Bypass; Heparin/adverse effects; Postoperative Complications/prevention & control; Thrombocytopenia/chemically induced; Thromboembolism/prevention & control; Adolescent; Adult; Aged; Autoantibodies/biosynthesis; Autoimmune Diseases/epidemiology; Autoimmune Diseases/immunology; Autoimmune Diseases/prevention & control; Child; Child, Preschool; Feasibility Studies; Female; Humans; Infant; Male; Mass Screening; Middle Aged; Platelet Count/drug effects; Postoperative Complications/chemically induced; Postoperative Complications/epidemiology; Postoperative Complications/immunology; Retrospective Studies; Thrombocytopenia/epidemiology; Thrombocytopenia/immunology; Thrombocytopenia/prevention & control; Thromboembolism/epidemiology; Thromboembolism/immunology