["Certification" in health services--insignificant or significant?].
Weidringer
J W
JW
Thaler
C J
CJ
D000068:Accreditation; D002568:Certification; D003695:Delivery of Health Care / Q000592:standards; D005858:Germany; D006296:Health Services / Q000592:standards*; D011785:Quality Assurance, Health Care