1. From the Mount Sinai Center for Eosinophilic Disorders, Icahn School of Medicine at Mount Sinai, New York (M.C.), and Regeneron Pharmaceuticals, Tarrytown (R.L., E. Mortensen, A.S., E. McCann, M.A.K., M.P.K., J.D.H., C.S., W.K.L., M.F.W., A.F., G.D.Y., J.M.) — both in New York; the Center for Esophageal Diseases and Swallowing, Division of Gastroenterology and Hepatology, University of North Carolina School of Medicine, Chapel Hill (E.S.D.); the Division of Allergy and Immunology, Children’s...