RT Journal Article SR Electronic T1 No man is an island: disentangling multilevel effects in health services research JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 177 OP 179 DO 10.1136/bmjqs-2013-002591 VO 23 IS 3 A1 Michelle Ko A1 Andrew B Bindman YR 2014 UL http://qualitysafety.bmj.com/content/23/3/177.abstract AB