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Wendel, U., Özalp, I., Langenbeck, U. et al. Phenylketonuria in turkey: Experience with an enzymatic colorimetric test for measurement of serum phenylalanine. J Inherit Metab Dis 13, 295–297 (1990). https://doi.org/10.1007/BF01799378
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DOI: https://doi.org/10.1007/BF01799378