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Meier C, Grehl H.Meier C, et al. Among authors: grehl h.Dtsch Med Wochenschr. 1988 Jan 29;113(4):135-8. doi: 10.1055/s-2008-1067607.Dtsch Med Wochenschr. 1988.PMID: 3338392German.
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Jaspert A, Grehl H, Claus D, Engelhardt A, Neundörfer B.Jaspert A, et al. Among authors: grehl h.Dtsch Med Wochenschr. 1993 Aug 20;118(33):1205-11. doi: 10.1055/s-2008-1059444.Dtsch Med Wochenschr. 1993.PMID: 8359113Review.German.No abstract available.