1. Pulmonary Disease & Critical Care Medicine, Department of Medicine, University of Vermont, Burlington, Vermont, USA
2. Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy
3. Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
4. Department of Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA