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Yuan S, Ewing NP, Bailey D, Salvador M, Wang S.Yuan S, et al. Among authors: ewing np.Immunohematology. 2007;23(2):75-80.Immunohematology. 2007.PMID: 18004938Review.
Powars DR, Conti PS, Wong WY, Groncy P, Hyman C, Smith E, Ewing N, Keenan RN, Zee CS, Harold Y, Hiti AL, Teng EL, Chan LS.Powars DR, et al.Blood. 1999 Jan 1;93(1):71-9.Blood. 1999.PMID: 9864148Free article.
Ewing N, Powars D, Hilburn J, Schroeder WA.Ewing N, et al.Am J Public Health. 1981 Jun;71(6):629-31. doi: 10.2105/ajph.71.6.629.Am J Public Health. 1981.PMID: 7235101Free PMC article.