Nontechnical information from trusted sources (like the cdc- disease control. Prevention and who- world health org. ) can provide helpful background on a topic. Factsheets and other informal information are not part of the formal peer-reviewed scientific literature (don"t cite them in formal reports) Good to identify relevant stats when defining specific exposures, diseases and/or pop. Un agency reports (world health statistics, human development report, state of the world"s children) Annual reports from groups such as the american cancer society and population. Information from state and local health departments - such as vital stats; birth and death rates; demographic indicators. Abstract: a paragraph-length summary of an article, chapter, or book. Use keywords to search multiple abstract databases. In health sciences, they usually provide: a brief description of the study pop, location, study design and key findings of the study. The most important component of a careful literature search: a careful and comprehensive search of at least one major abstract database.