Using a novel ontology to improve case-finding of primary biliary cholangitis (PBC) in the patient database of the Royal College of General Practitioners (RCGP) of the United Kingdom (UK)-implications for early diagnosis and management - Pericleous, M; Kelly, C; McGee, C; Sherlock, J; Yonova, I; Byford, R; Ferreira, F; De Lusignan, S; Ala, A (Wiley, 2018)