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200 10$aPatterns of ambulatory care in office visits to general surgeons : the National Ambulatory Medical Care Survey, United States, January 1980-December 1981
210   $aHyattsville, Md$cU.S. Department of Health and Human Services, Public Health Service, National Center for Health Statistics
517   $aPatterns of ambulatory care in office visits to general surgeons 
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996   $aPatterns of ambulatory care in office visits to general surgeons : the National Ambulatory Medical Care Survey, United States, January 1980-December 1981$93334730
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