Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF ++ Robert B. Wallace, MD, MSc ++ ++ Associate Editor ++ Neal Kohatsu, MD ++ ++ Editor Emeritus ++ John M. Last, MD, DPH ++ ++ ++ Section Editors ++ Ross Brownson, PhD • Arnold J. Schecter, MD, MPH • F. Douglas Scutchfield, MD • Stephanie Zaza, MD, MPH