Anniversaries and Special Events: Occasions to commemorate an event or occasions designated for a specific purpose.History, 20th Century: Time period from 1901 through 2000 of the common era.History, 21st Century: Time period from 2001 through 2100 of the common era.History, 19th Century: Time period from 1801 through 1900 of the common era.History, 16th Century: Time period from 1501 through 1600 of the common era.History of DentistryHistory, 17th Century: Time period from 1601 through 1700 of the common era.Societies, Scientific: Societies whose membership is limited to scientists.History, 18th Century: Time period from 1701 through 1800 of the common era.History, Medieval: The period of history from the year 500 through 1450 of the common era.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.Societies, Medical: Societies whose membership is limited to physicians.Molecular Biology: A discipline concerned with studying biological phenomena in terms of the chemical and physical interactions of molecules.Biomedical Research: Research that involves the application of the natural sciences, especially biology and physiology, to medicine.Cardiology: The study of the heart, its physiology, and its functions.Centers for Disease Control and Prevention (U.S.): An agency of the UNITED STATES PUBLIC HEALTH SERVICE that conducts and supports programs for the prevention and control of disease and provides consultation and assistance to health departments and other countries.