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van Ahlen H, Porst H, Löcherbach-Zawadzky A, Klingmüller D.van Ahlen H, et al. Among authors: klingmuller d.Dtsch Med Wochenschr. 1988 Jul 1;113(26):1047-52. doi: 10.1055/s-2008-1067764.Dtsch Med Wochenschr. 1988.PMID: 3133190German.