Ogrinc G., Mooney SE, Estrada C., Foster T., Goldmann D. and Hall LW ( 2008) The SQUIRE (Standards for QUality Improvement Reporting Excellence) guidelines for quality improvement reporting: explanation and elaboration. Qual Saf Health Care17: i13-i32http://qualitysafety.bmj.com/content/17/Suppl_1/i13.full .