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Gossner L, Stolte M, Sroka R, May A, Hahn EG, Ell C.Gossner L, et al. Among authors: ell c.Z Gastroenterol. 1998 Jan;36(1):19-26.Z Gastroenterol. 1998.PMID: 9531686German.
Rabenstein T, Benninger J, Farnbacher M, May A, Ell C, Katalinic A, Hahn EG, Schneider HT.Rabenstein T, et al. Among authors: ell c.Z Gastroenterol. 1999 Mar;37(3):209-17.Z Gastroenterol. 1999.PMID: 10234793Clinical Trial.German.
Ell C, May A, Hahn EG.Ell C, et al.Dtsch Med Wochenschr. 1995 Oct 6;120(40):1343-8. doi: 10.1055/s-2008-1055483.Dtsch Med Wochenschr. 1995.PMID: 7555650Clinical Trial.German.