http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Alternative volume performance standards for Medicare physicians' services
Rand/UCLA/Harvard Center for Health Care Financing Policy Research
"Supported by the Health Care Financing Administration, U.S. Department of Health and Human Services."
Includes bibliographic references (pages 37-41).