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Barth H, Berg PA, Klein R.Barth H, et al. Among authors: klein r.Adv Exp Med Biol. 1999;467:487-96. doi: 10.1007/978-1-4615-4709-9_61.Adv Exp Med Biol. 1999.PMID: 10721092
Barth H, Klein R, Berg PA, Wiedenmann B, Hopf U, Berg T.Barth H, et al. Among authors: klein r.Hepatogastroenterology. 2001 Mar-Apr;48(38):553-5.Hepatogastroenterology. 2001.PMID: 11379352
Barth H, Klein K, Börtlein A, Guseo A, Berg PA, Wiethölter H, Klein R.Barth H, et al. Among authors: klein k, klein r.J Neuroimmunol. 2002 Dec;133(1-2):175-83. doi: 10.1016/s0165-5728(02)00355-7.J Neuroimmunol. 2002.PMID: 12446020
Klein R, Franz M, Wacker R, Classen K, Scheer R, Von Laue HB, Stoeva S, Voelter W.Klein R, et al.Eur J Med Res. 2004 Jun 30;9(6):316-22.Eur J Med Res. 2004.PMID: 15257874
Klein R, Classen K, Berg PA, Lüdtke R, Werner M, Huber R.Klein R, et al.Eur J Med Res. 2002 Apr 30;7(4):155-63.Eur J Med Res. 2002.PMID: 12010650Clinical Trial.
Huber R, Rostock M, Goedl R, Lüdtke R, Urech K, Buck S, Klein R.Huber R, et al. Among authors: klein r.Eur J Med Res. 2005 Oct 18;10(10):411-8.Eur J Med Res. 2005.PMID: 16287602Clinical Trial.