The effectiveness of physiologically based early warning or track and trigger systems after triage in adult patients presenting to emergency departments: a systematic review. - Wuytack, Francesca; Meskell, Pauline; Conway, Aislinn; McDaid, Fiona; Santesso, Nancy; Hickey, Fergal G.; Gillespie, Paddy; Raymakers, Adam J. N.; Smith, Valerie; Devane, Declan (BMC Emergency Medicine, 2017)