Eisendle K, Müller H, Ortner E, Talasz H, Graziadei I, Vogel W, Höpfl R. Pruritus of unknown origin and elevated total serum bile acid levels in patients without clinically apparent liver disease. J Gastroenterol Hepatol. 2011 Apr;26(4):716–21. doi: 10.1111/j.1440-1746.2010.06522.x. PMID: 21155876.