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Homann N, Klarmann U, Fellermann K, Brüning A, Klingenberg-Noftz R, Witthöft T, Stange EF, Ludwig D.Homann N, et al. Among authors: ludwig d.Inflamm Bowel Dis. 2005 Feb;11(2):126-32. doi: 10.1097/00054725-200502000-00005.Inflamm Bowel Dis. 2005.PMID: 15677905
Stahl M, Ludwig D, Fellermann K, Stange EF.Stahl M, et al. Among authors: ludwig d.Dig Dis Sci. 1998 May;43(5):1079-87. doi: 10.1023/a:1018847205420.Dig Dis Sci. 1998.PMID: 9590425
Woywodt A, Ludwig D, Neustock P, Kruse A, Schwarting K, Jantschek G, Kirchner H, Stange EF.Woywodt A, et al. Among authors: ludwig d.Eur J Gastroenterol Hepatol. 1999 Mar;11(3):267-76. doi: 10.1097/00042737-199903000-00010.Eur J Gastroenterol Hepatol. 1999.PMID: 10333199
Ludwig D, Stahl M, Ibrahim ET, Wenzel BE, Drabicki D, Wecke A, Fellermann K, Stange EF.Ludwig D, et al.Dig Dis Sci. 1999 Jul;44(7):1440-7. doi: 10.1023/a:1026616221950.Dig Dis Sci. 1999.PMID: 10489932