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Publisher
- elsevier bv80
- ovid technologies (wolters kluwer health)13
- american medical association (ama)4
- american college of cardiology foundation. published by elsevier inc.3
- elsevier2
- oxford university press (oup)2
- the american association for thoracic surgery. published by mosby, inc.2
- american college of cardiology. published by elsevier inc.1
- bmj1