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Y. A. DeClerck, R. B. Ettenger, J. A. Ortega, A. J. Pennisi: Macrocytosis and pure RBC anemia caused by azathioprine. In: American journal of diseases of children. Band 134, Nummer 4, April 1980, S. 377–379, doi:10.1001/archpedi.1980.04490010035012, PMID 6989234.