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Feikema, W. J., F. J. M. Gabreëls enJ. Willemse (1973)Ned. Tijdschr. Geneesk. 117, 686–690
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Nelen, T.H.A. Ingezonden. Pharmaceutisch Weekblad Scientific Edition 3, 22–24 (1981). https://doi.org/10.1007/BF02193114
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DOI: https://doi.org/10.1007/BF02193114