1. From the Division of Surgical Science, Department of Surgery (L.G.B., T.W., W.Q., Y.L., L.R., M.T.G., B.M., T.K., D.C.L., Y.K., D.M.S., A.M.S.); Department of Physiology & Cellular Biophysics (D.M.S.), College of Physicians & Surgeons; and Division of Periodontics, School of Dental & Oral Surgery (E.L.), Columbia University, New York, NY.