Amos Lal1, Ajay Kumar Mishra2, Kamal Kant Sahu3. 1. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester MN, United States. Electronic address: lal.amos@mayo.edu. 2. Department of Medicine, Saint Vincent Hospital, Worcester, MA, United States. Electronic address: Ajay.Mishra@stvincenthospital.com. 3. Department of Medicine, Saint Vincent Hospital, Worcester, MA, United States. Electronic address: kamalkant.sahu@stvincenthospital.com.