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Watkins NA, Schaffner-Reckinger E, Allen DL, Howkins GJ, Brons NH, Smith GA, Metcalfe P, Murphy MF, Kieffer N, Ouwehand WH.Watkins NA, et al. Among authors: ouwehand wh.Blood. 2002 Mar 1;99(5):1833-9. doi: 10.1182/blood.v99.5.1833.Blood. 2002.PMID: 11861302Free article.