Thickett, DavidVoorham, JacoRyan, RonanJones, RupertCoker, RobinaWilson, Andrew M.Yang, SenOw, Mandy YLRaju, PriyankaChaudhry, IshaHardjojo, AntonyCarter, VictoriaPrice, David B.2020-06-022020-06-022020Thickett, D, Voorham, J, Ryan, R, Jones, R, Coker, R, Wilson, A M, Yang, S, Ow, M YL, Raju, P, Chaudhry, I, Hardjojo, A, Carter, V & Price, D B 2020, 'Historical Database Cohort Study Addressing the Clinical Patterns Prior to Idiopathic Pulmonary Fibrosis (IPF) Diagnosis in UK Primary Care', BMJ Open, vol. 10, no. 5, e034428. https://doi.org/10.1136/bmjopen-2019-0344282044-6055https://hdl.handle.net/2164/14421Acknowledgments The authors would like to extend their acknowledgement to Dr Dermot Ryan for his clinical and scientific input. Funding: This study was partly funded by Roche Products Ltd and the Observational and Pragmatic Research Institute (OPRI). Roche was not involved in the preparation, drafting or editing of this manuscript. Data availability statement: The data set supporting the conclusions of this article was derived from the Optimum Patient Care Research Database (www.opcrd.co.uk). The authors do not have permission to give public access to the study data set; researchers may request access to OPCRD data for their own purposes. Access to OPCRD can be made via the OPCRD website (https://opcrd.co.uk/our-database/data-requests/) or via the enquiries email info@opcrd.co.uk. The OPCRD has ethical approval from the National Health Service (NHS) Research Authority to hold and process anonymised research data (Research Ethics Committee reference: 15/EM/0150). This study was approved by the Anonymised Data Ethics Protocols and Transparency (ADEPT) committee—the independent scientific advisory committee for the OPCRD.102107201engfree-text recordinterstitial lung diseasepathway featuresprincipal component analysisPREVALENCER Medicine (General)General MedicineSupplementary DataR1Journal article10.1136/bmjopen-2019-034428http://www.scopus.com/inward/record.url?scp=85085854937&partnerID=8YFLogxK105