Stefan MS, Nathanson BH, Priya A, Pekow PS, Lagu T, Steingrub JS, Hill NS, Goldberg RJ, Kent DM, Lindenauer PK. Hospitals' Patterns of Use of Noninvasive Ventilation in Patients With Asthma Exacerbation. Chest. 2016 Mar; 149(3):729-36.