RT Journal Article SR Electronic T1 A spotter’s guide to study designs JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 71 OP 72 DO 10.1136/ebn.12.3.71 VO 12 IS 3 A1 Paul Glasziou A1 Carl Heneghan YR 2009 UL http://ebn.bmj.com/content/12/3/71.abstract AB