1 Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA, United States.
2 Acute Lung Injury and Infection Center, University of Pittsburgh, Pittsburgh, PA, United States.
3 San Antonio Geriatric Research Education and Clinical Center (GRECC), South Texas Veterans Health Care System Audie L. Murphy Division, San Antonio, TX, United States.
4 Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Texas Health at San Antonio, San Antonio, TX, United States.
5 Department of Pediatrics, Nationwide Children's Hospital and The Ohio State University, Columbus, OH, United States.
6 Department of Medicine, University of Toronto and St Michael's Hospital, Toronto, ON, Canada.
7 Department of Medicine, University of Saskatchewan, Saskatoon, SK, Canada.
8 Department of Medicine, Hospital Nacional de Niños, Asociación Latinoamericana de Tórax, San José, Costa Rica.
9 Department of Pulmonary Medicine, Instituto Nacional del Tórax, Asociación Latinoamericana de Tórax, Santiago, Chile.
10 Department of Medicine, Centro Universitário do Pará CESUPA, Belém, Brazil.
11 Instituto da Criança e do Adolescente, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil.
12 Division of Pediatric Pulmonary Medicine, UPMC Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.
13 Division of Pulmonary and Sleep Medicine, Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States.