RT Journal Article SR Electronic T1 Issues of validity and reliability in qualitative research JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 34 OP 35 DO 10.1136/eb-2015-102054 VO 18 IS 2 A1 Helen Noble A1 Joanna Smith YR 2015 UL http://ebn.bmj.com/content/18/2/34.abstract AB