TY - BOOK ED - United States. TI - Zero crossers PY - 1991/// CY - [Washington, D.C.] PB - Department of Health and Human Services, Office of Inspector General KW - Medicare KW - Diagnostic ultrasonic imaging KW - United States KW - Equipment and supplies KW - Costs KW - Cardiovascular system KW - Testing KW - Cardiovascular equipment industry KW - Prices N1 - "August 1991."; "OEI-03-91-00460."; CRDP Project record UR - http://purl.fdlp.gov/GPO/gpo74069 ER -