1. 1. American Hospital Association Hospital Statistics. 1992-93 Edition. Chicago: AHA, 1992, p 12.
2. 5. Report on the Need to Collect External Cause-of-Injury Codes in Hospital Discharge Data. Washington DC: National Committee on Vital and Health Statistics, Subcommittee on Ambulatory and Hospital Care Statistics, Working Paper Series, Number 38, June 1991.