Development of a cardiac-centered frailty ontology. - Kristina Doing-Harris; Bruce E. Bray; Anne Thackeray; Rashmee U. Shah; YiJun Shao; Yan Cheng; Qing Zeng-Treitler; Jennifer H. Garvin; Charlene R. Weir (J. Biomed. Semant., 2019)