MEDLINE is the National Library of Medicine’s bibliographic database/article index that contains over 17 million references to journal articles. Coverage is from 1949 to the present. Over 5200 journals worldwide in over 37 languages are indexed. Covered are basic biomedical research and the clinical sciences, including 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. Ovid, a software company specializing in text retrieval applications and search interfaces, provides an easy to use interface for searching MEDLINE.