RT Journal Article SR Electronic T1 Using statistical process control to improve the quality of health care JF Quality and Safety in Health Care JO Qual Saf Health Care FD BMJ Publishing Group Ltd SP 243 OP 245 DO 10.1136/qshc.2004.011650 VO 13 IS 4 A1 Mohammed, M A YR 2004 UL http://qualitysafety.bmj.com/content/13/4/243.abstract AB