RT Journal Article SR Electronic T1 The reciprocal relationship between physical activity and depression in older European adults JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP ebnurs-2011-100294 DO 10.1136/ebnurs-2011-100294 A1 John Owiti A1 Kamaldeep Singh Bhui YR 2012 UL http://ebn.bmj.com/content/early/2012/04/24/ebnurs-2011-100294.abstract AB