RT Journal Article SR Electronic T1 Nurse:patient ratios influence the achievement of oxygen saturation targets in premature infants JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 15 OP 16 DO 10.1136/ebnurs-2011-100029 VO 15 IS 1 A1 Julia Petty YR 2012 UL http://ebn.bmj.com/content/15/1/15.abstract AB