RT Journal Article SR Electronic T1 Sleep position does not appear to influence the risk of extreme cardiorespiratory events in vulnerable infants JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 51 OP 52 DO 10.1136/eb-2012-101003 VO 16 IS 2 A1 Dawn E Elder YR 2013 UL http://ebn.bmj.com/content/16/2/51.abstract AB