Schreiber 2017.

Methods	RCT, cross‐over design. Single‐entre study
Participants	Total number of participants: 20 Inclusion criteria: acute respiratory failure; spontaneously breathing patients Exclusion criteria: none in abstract
Interventions	Three 60‐minute trials with the following therapies in random order. Intervention (HFNC): flow = 60 L/min Control 1: (NIV) Control 2: (standard oxygen therapy)
Outcomes	All outcomes reported: lung ultrasound aeration score; diaphragm thickening fraction; diaphragm excursion Outcomes relevant to this review: none
Notes	Contact: Annia Fleur Schreiber, Respiratory Intensive Care Unit and Pulmonary Rehabilitation Unit, Istituti Clinici Scientifici Maugeri IRCCS, Pavia, Italy Currently published only as an abstract. We are awaiting publication of the full report in order to assess eligibility, collect sufficient study characteristics, and include data in the review.