PT - JOURNAL ARTICLE AU - David P Stevens TI - Quality lines DP - 2009 Feb 01 TA - Quality and Safety in Health Care PG - i--i VI - 18 IP - 1 4099 - http://qualitysafety.bmj.com/content/18/1/i.short 4100 - http://qualitysafety.bmj.com/content/18/1/i.full SO - Qual Saf Health Care2009 Feb 01; 18