1. National Center for Health Statistics. Health United States, 1991. Hyattsville, MD: Public Health Service; 1992.
2. The failure of success;Gruenberg;MMFG,1977
3. The International Classification of Diseases, 9th revision, Clinical Modification;US Department of Health and Human Services,1980
4. Detailed diagnoses and procedures, National Hospital Discharge Survey, 1990;Graves;Vital Health Stat.,1992
5. Current estimates from the National Health Interview Survey, 1990;Adams;Vital Health Stat.,1991