|
|
|||
| |||||||||||||||||||||||||||||||||||||
The Medline data base was searched with the use of the Internet provider PubMed in October 1998. Searches were performed by first selecting the advanced-search
References
This article has been cited by other articles:
HOME | SUBSCRIBE | SEARCH | CURRENT ISSUE | PAST ISSUES | COLLECTIONS | PRIVACY | TERMS OF USE | HELP | beta.nejm.org Comments and questions? Please contact us. The New England Journal of Medicine is owned, published, and copyrighted © 2009 Massachusetts Medical Society. All rights reserved. |