1. Lammers WJ, et al (2014). Levels of Alkaline Phosphatase and Bilirubin Are Surrogate End Points of Outcomes of Patients With Primary Biliary Cirrhosis: An International Follow-up Study. Gastroenterology ,147, pp. 1338–49. Available at: http://pure-oai.bham.ac.uk/ws/ fi-
les/18372787/Hirschfield_Levels_alkaline_phosphatase_bilirubin_Gastroenterology_2014.pdf.. [Accessed March 2017].
2. Shapiro JM et al (1979). Serum bilirubin: a prognostic factor in primary biliary cirrhosis. Gut, 20, pp.137-140.

3. Mayo Clinic, (2016). Test ID: ALP. Alkaline Phosphatase, Serum. [online] Available at: http://www.mayomedicallaboratories.com/test-catalog/ Clinical+and+Interpretive/8340. [Accessed March 2017]