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1. National Ambulatory Medical Care Survey : public use data on diskette
   HE 20.6209/4-4:13/3
2. National Home and Hospice Care Survey
   HE 20.6209/4-5: 27 (1998)
3. National ambulatory medical care survey
   HE 20.6209/4-5:13/
4. National Hospital Ambulatory Medical Care Survey
   HE 20.6209/4-5:13/ 25 (2000)