MEDLINE is the National Library of Medicine’s bibliographic database/article index that contains over 27 million references to journal articles. More than 5,200 journals worldwide in over 37 languages are indexed. Covered are basic biomedical research and the clinical sciences, including clinical medicine, public health, nursing, dentistry, veterinary medicine, pharmacy, allied health and pre-clinical sciences as well as life sciences that are important to practitioners and researchers – biology, environmental science, biophysics, chemistry and plant & animal science. Coverage is from 1946-present.