1. Pulmonary and Critical Care, Providence VMAC, Providence, Rhode Island, USA;
2. The Alpert Medical School, Brown University, Providence, Rhode Island, USA;
3. Pulmonary and Critical Care, St Francis Hospital (Trinity), Hartford, Connecticut, USA;
4. University of CT School of Medicine, Farmington, Connecticut, USA;
5. Frank H. Netter MD School of Medicine, Quinnipiac University, North Haven, Connecticut, USA