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 7 OP 8 DO 10.1136/eb-2017-102845 VO 21 IS 1 A1 Roberta Heale A1 Alison Twycross YR 2018 UL http://ebn.bmj.com/content/21/1/7.abstract AB