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Koop H, Arnold R.Koop H, et al.Dtsch Med Wochenschr. 1988 Mar 31;113(13):516-8. doi: 10.1055/s-2008-1067675.Dtsch Med Wochenschr. 1988.PMID: 2894969Clinical Trial.German.No abstract available.
Koop H, Klein M, Arnold R.Koop H, et al.Aliment Pharmacol Ther. 1990 Apr;4(2):131-8. doi: 10.1111/j.1365-2036.1990.tb00457.x.Aliment Pharmacol Ther. 1990.PMID: 2104080
Koop H, Koop I, Klein M, Stumpf M, Massarrat S, Arnold R.Koop H, et al. Among authors: koop i.J Clin Gastroenterol. 1989 Dec;11(6):631-4. doi: 10.1097/00004836-198912000-00006.J Clin Gastroenterol. 1989.PMID: 2573627