Ascertaining provider-level implicit bias in electronic health records with rules-based natural language processing: A pilot study in the case of prostate cancer - Ashwin Ramaswamy; Michael Hung; Joe Pelt; Parsa Iranmahboub; Lina P. Calderon; Ian S. Scherr; Gerald Wang; David Green; Neal Patel; Timothy D. McClure; Christopher Barbieri; Jim C. Hu; et al. (PLoS ONE)