In this press review by Rhona MacDonald (21 April, p 1002) we inadvertently twice misspelt the name of Kenneth Nunn [as Dunn]. We apologise to Professor Nunn for this.
. 2001 May 19;322(7296):1237.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.