Introduction to public health [electronic resource] / Mary-Jane Schneider, PhD, Clinical Associate Professor, Department of Health Policy, Management, and Behavior, School of Public Health, University at Albany, State University of New York, Rensselaer, New York, with Henry S. Schneider, PhD, Assistant Professor of Economics, Johnson Graduate School of Management, Cornell University, Ithaca, New York ; drawings by Henry S. Schneider.