1. From the Swim Across America Laboratory (D.T.L., J.N.U., B.R.B., L.A.D.), Sidney Kimmel Comprehensive Cancer Center (D.T.L., J.N.U., H.W., H.K., A.D.E., A.D.S., B.S.L., N.S.A., D.L., B.B., R.C.D., D.M.P., N.P., K.W.K., S.Z., B.V., L.A.D.), Ludwig Center and Howard Hughes Medical Institute (B.R.B., A.D.S., N.P., K.W.K., S.Z., B.V., L.A.D.), and the Departments of Radiology (A.Z.) and Pathology (F.B., T.H., R.H.H., L.D.W., N.C., T.C.C., J.M.T., R.A.A., J.R.E.), Johns Hopkins University School of Medicine,...