The objective of this series is to provide medical researchers and libraries with single sources to scattered research results in selected disciplinary and interdisciplinary fields. The topics for these books have been chosen for their timeliness to current research requirements. The literature searches to compile these books have been as extensive as possible for the years covered for each book. We plan to offer updated supplements to various volumes as there- search in these fields accumulates and based on users' continued interest in the subject matter. This major contribution to the medical literature has been made possible through the efforts of the Medical Documentation Service staff and the dedicated work of Mrs. K. Bernice Odom, who set the standards for bibliographic reporting and who spent long hours in copy- editing.