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Yamakawa, R., Kimura, A., Aoki, K. et al. Urinary 1β-hydroxyursodeoxycholic acid during ursodeoxycholic acid therapy. J Gastroenterol 31, 917–918 (1996). https://doi.org/10.1007/BF02358625
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DOI: https://doi.org/10.1007/BF02358625