Do referral practices affect the results of coronary artery surgery?
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D001026:Coronary Artery Bypass / Q000401:mortality*; D003327:Coronary Disease / Q000401:mortality*; D018588:Fee-for-Service Plans; D006279:Health Maintenance Organizations; D006801:Humans; D012017:Referral and Consultation; D015996:Survival Rate; D016896:Treatment Outcome; D014481:United States