1. Johns Hopkins School of Nursing, Baltimore, MD (F.E.M., T.H., C.B., O.O., C.R.H., Y.C.-M.).
2. Johns Hopkins School of Nursing, Baltimore, MD (A.A.).
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, MD (C.R.H., O.O., Y.C.-M.).
4. Department of Medicine, Research Section, Beth Israel Deaconess Medical Center, Boston, MA (R.-A.N.T.-O.).
5. Harvard School of Medicine, Boston, MA (R.-A.N.T.-O.).
6. Johns Hopkins School of Medicine, Baltimore, MD (C.R.H.).