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Wahl P, Hasslacher C, Lang PD, Vollmar J.Wahl P, et al.Dtsch Med Wochenschr. 1978 Aug 4;103(31):1233-7. doi: 10.1055/s-0028-1129237.Dtsch Med Wochenschr. 1978.PMID: 668570German.
Hasslacher C, Müller A, Panradl U, Wahl P.Hasslacher C, et al. Among authors: wahl p.Dtsch Med Wochenschr. 1989 Jun 23;114(25):980-2. doi: 10.1055/s-2008-1066703.Dtsch Med Wochenschr. 1989.PMID: 2737091German.
Hasslacher C, Wahl P.Hasslacher C, et al. Among authors: wahl p.Dtsch Med Wochenschr. 1971 Nov 12;96(46):1787-91. doi: 10.1055/s-0028-1110218.Dtsch Med Wochenschr. 1971.PMID: 5000535German.No abstract available.