RT Journal Article SR Electronic T1 What is a case study? JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP ebnurs-2017-102845 DO 10.1136/eb-2017-102845 A1 Roberta Heale A1 Alison Twycross YR 2017 UL http://ebn.bmj.com/content/early/2017/11/16/eb-2017-102845.abstract AB