Unaccredited component organizations' sampling methodology revised.
D000068:Accreditation / Q000379:methods*; D001524:Behavioral Medicine / Q000592:standards; D002568:Certification; D019058:Community Networks / Q000592:standards*; D019538:Health Care Surveys / Q000379:methods; D006801:Humans; D007591:Joint Commission on Accreditation of Healthcare Organizations; D011243:Preferred Provider Organizations / Q000592:standards*; D012107:Research Design; D018401:Sample Size; D014481:United States