Some long-time users of the book may notice that the familiar Hanley & Belfus imprint has been replaced by Elsevier's Saunders imprint. No matter what the imprint, however, the same care as always has been taken in the selection of entries and the verification of their accuracy. The familiar format of boldface acronyms and abbreviations followed by run-in meanings has been retained, allowing the book to be kept to a convenient size. New terms have been drawn especially from the areas of virology, clinical trials, new technology, and medical informatics.