<ref>http://www.nejm.org/doi/full/10.1056/NEJM199111213252106 Retraction: Stricker RB, Abrams DI, Corash L, Shuman MA. Target platelet antigen in homosexual men with immune thrombocytopenia. N Engl J Med 1985; 313:1375-80. N Engl J Med 1991; 325:1487November 21, 1991</ref> | <ref>http://www.nejm.org/doi/full/10.1056/NEJM199111213252106 Retraction: Stricker RB, Abrams DI, Corash L, Shuman MA. Target platelet antigen in homosexual men with immune thrombocytopenia. N Engl J Med 1985; 313:1375-80. N Engl J Med 1991; 325:1487November 21, 1991</ref> |