1. Management Decision and Research Center (152M), Health Services Research and Development Service, Veterans Health Administration, Boston, Mass and with the Health Services Department, Boston University School of Public Health, Boston, MA, Center for Health Quality Outcomes and Economic Research, Bedford, MA
2. Management Decision and Research Center (152M), Health Services Research and Development Service, Veterans Health Administration, Boston, Mass and with the Health Services Department, Boston University School of Public Health, Boston, MA