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Ballas SK, Bauserman RL, McCarthy WF, Waclawiw MA; Multicenter Study of Hydroxyurea in Sickle Cell Anemia.Ballas SK, et al. Among authors: bauserman rl.J Natl Med Assoc. 2010 Nov;102(11):993-9.J Natl Med Assoc. 2010.PMID: 21141286Clinical Trial.