<<Disclaimer: Verify this information before applying it to your situation.>>
The article has a link to the U.S. submission. They advocate the 20ppm.
There are also directions on labeling.
http://snipurl.com/1rlek
-Michael Thorn
Visit the Celiac Web Page at Http://www.enabling.org/ia/celiac/index.html
Archives are at: Http://Listserv.icors.org/SCRIPTS/WA-ICORS.EXE?LIST=CELIAC