1. Department of Critical Care, Believers Church Medical College Hospital, Thiruvalla, Kerala, India
2. Department of Nuclear Medicine, Christian Medical College, Vellore, India
3. Department of Cardiovascular Medicine, Saint Vincent Hospital, Worcester, MA, USA
4. Department of Medicine, The Miriam Hospital & Warren Alpert Medical School of Brown University, Providence, RI 02906, USA
5. Department of Cardiology, University of Kentucky at Bowling Green, Bowling Green, KY 42102, USA
6. Department of Medicine, Division of Pulmonary, Critical Care Medicine and Sleep Medicine Mayo Clinic, 200 First Street Southwest Rochester, Rochester, MN 55905, USA