title: An evaluation of index medicus in rheumatology: coverage, currency and efficiency.
mesh_terms: D000043:Abstracting and Indexing; D005069:Evaluation Studies as Topic; D006801:Humans; D007256:Information Systems; D008511:Medicine; D012216:Rheumatic Diseases; D013038:Specialization; D013997:Time Factors; D014481:United States