title: Four years of replacing ailing hearts: surgeons assess data, questions remain.
mesh_terms: D002561:Cerebrovascular Disorders / Q000209:etiology; D035082:Federal Government; D005544:Forecasting; D033161:Government Regulation; D016027:Heart Transplantation; D006354:Heart, Artificial / Q000009:adverse effects; D006801:Humans; D018579:Patient Selection; D011788:Quality of Life; D035842:Research Subjects; D040841:Resource Allocation