Dr. Donald A. Mahler, M.D., is Emeritus Professor of Medicine at Geisel School of Medicine at Dartmouth in Hanover, New Hampshire. He currently works as a pulmonary physician at Valley Regional Hospital in Claremont, New Hampshire, where he is Director of Respiratory Services. Dr. Rajiv Dhand serves as Professor of Medicine with tenure, the Wahid T. Hanna, MD Endowed Chair of the Department of Medicine, Service Chief of the Medical Service and Associate Dean of Clinical Affairs at the University of Tennessee, Graduate School of Medicine in Knoxville, TN.