1. From the Feinberg School of Medicine, Northwestern University, Chicago (C.W.Y.); Olin College of Engineering, Needham, MA (G.B.); the Brody School of Medicine, East Carolina University, Greenville, NC (C.B.); the Cato T. Laurencin Institute for Regenerative Engineering, University of Connecticut, Farmington (C.T.L.); and Morehouse School of Medicine, Atlanta (V.M.R.).