"Public health research often focuses on health promotion and disease prevention to ensure the health of populations. A key element in public health research is defining what public health interventions or programs work most effectively to generate a positive, population-level change in public health."
Porche, James Demetrius. Public & Community Health Nursing Practice: A Population-Based Approach. SAGE, 2004. http://dx.doi.org.myaccess.library.utoronto.ca/10.4135/9781483328669.n15.
Grey Literature