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2. Risk of carotid endarterectomy in the elderly;Fisher;Am J Public Health,1989
3. The influences of age and hospital volume on the results of carotid endarterectomy: A state-wide analysis of 9,918 cases;Perler,1997
4. Differences among hospitals in Medicare patient mortality;Chassin;Health Serv Res,1989
5. Physician and hospital factors associated with mortality of surgical patients;Kelly;Med Care,1986