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Leung W, Ahn H, Rose SR, Phipps S, Smith T, Gan K, O'Connor M, Hale GA, Kasow KA, Barfield RC, Madden RM, Pui CH.Leung W, et al. Among authors: barfield rc.Medicine (Baltimore). 2007 Jul;86(4):215-224. doi: 10.1097/MD.0b013e31812f864d.Medicine (Baltimore). 2007.PMID: 17632263Free article.