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National Hospital Discharge Survey (NHDS):  http://www.cdc.gov/nchs/products/pubs/pubd/series/sr13/pre-141/sr13_148.htm

National Survey of Ambulatory Survey (NSAS):  http://www.cdc.gov/nchs/about/major/hdasd/nsascol.htm

National Center for Health Statistics:   
http://www.cdc.gov/nchs/default.htm