1. The development of indicators to measure the quality of clinical care in emergency departments following a modified-Delphi approach;Lindsay;Acad Emerg Med.,2002
2. Plan and operation of the National Hospital Ambulatory Medical Survey. Series 1: programs and collection procedures;McCaig;Vital Health Stat 1,1994
3. Centers for Disease Control and Prevention 2003 NHAMCS Micro-Data File Documentation http://www.nber.org/nhamcs/1992-/ftp.cdc.gov/pub/Health_Statistics/NCHS/Dataset_Documentation/NHAMCS/doc03.pdf
4. Office of Management and Budget Final Report and Recommendations from the Metropolitan Area Standards Review Committee to the Office of Management and Budget Concerning Changes to the Standards for Defining Metropolitan Areas http://www.whitehouse.gov/sites/default/files/omb/inforeg/metro2000.pdf