FIRST-line support for Assistance in Breathing in Children (FIRST-ABC): a multicentre pilot randomised controlled trial of high-flow nasal cannula therapy versus continuous positive airway pressure in paediatric critical care - Ramnarayan, P; Lister, P; Dominguez, T; United Kingdom Paediatric Intensive Care Society Study Group (PICS-SG) (Crit Care, 2018)