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N Engl J Med. 1971 Apr 15;284(15):878-81. doi: 10.1056/NEJM197104222841604. N Engl J Med. 1971. PMID: 5549830 No abstract available. . Haemophilia. 2001 Jan;7(1):99-102. doi: 10.1046/j.1365-2516.2001.00471.x. Haemophilia. 2001. PMID: 11136389