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Leunig A, Rick K, Stepp H, Goetz A, Baumgartner R, Feyh J.Leunig A, et al. Among authors: rick k.Laryngorhinootologie. 1996 Aug;75(8):459-64. doi: 10.1055/s-2007-997615.Laryngorhinootologie. 1996.PMID: 8962607German.
Rick K, Sroka R, Stepp H, Kriegmair M, Huber RM, Jacob K, Baumgartner R.Rick K, et al.J Photochem Photobiol B. 1997 Oct;40(3):313-9. doi: 10.1016/s1011-1344(97)00076-6.J Photochem Photobiol B. 1997.PMID: 9372622
Kriegmair M, Stepp H, Steinbach P, Lumper W, Ehsan A, Stepp HG, Rick K, Knüchel R, Baumgartner R, Hofstetter A.Kriegmair M, et al. Among authors: rick k.Urol Int. 1995;55(4):190-6. doi: 10.1159/000282784.Urol Int. 1995.PMID: 8588264
Gossner L, Stolte M, Sroka R, Rick K, May A, Hahn EG, Ell C.Gossner L, et al. Among authors: rick k.Gastroenterology. 1998 Mar;114(3):448-55. doi: 10.1016/s0016-5085(98)70527-x.Gastroenterology. 1998.PMID: 9496934
Baumgartner R, Huber RM, Schulz H, Stepp H, Rick K, Gamarra F, Leberig A, Roth C.Baumgartner R, et al. Among authors: rick k.J Photochem Photobiol B. 1996 Nov;36(2):169-74. doi: 10.1016/s1011-1344(96)07365-4.J Photochem Photobiol B. 1996.PMID: 9002254