RT Journal Article SR Electronic T1 Understanding triangulation in research JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP ebnurs-2013-101494 DO 10.1136/eb-2013-101494 A1 Roberta Heale A1 Dorothy Forbes YR 2013 UL http://ebn.bmj.com/content/early/2013/08/13/eb-2013-101494.abstract AB