1 From the Department of Pathology, Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, Boston, MA 02114 (L.P.H.); Department of Pathology, the Icahn School of Medicine at Mount Sinai, New York, NY (M.B.B.); Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Mass (L.M.S.); Division of Pathology and Laboratory Medicine, Division of Pulmonary Medicine, and Perinatal Institute Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio (K.A.W.B.); and Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio (K.A.W.B.).