I remember I posted on beesource about this a while ago. Hopefully these links still work- I do not have time to check them right now. Here is just a sample of what is out there. http://cat.inist.fr/?aModele=afficheN&cpsidt=2487690 http://www.jiaci.org/issues/vol18issue2/4.pdf http://www.ncbi.nlm.nih.gov/pubmed/3154984 http://www.ncbi.nlm.nih.gov/pubmed/9824397 http://www.uptodateonline.com/patien...ZpAM&refNum=28 http://www.ncbi.nlm.nih.gov/pubmed/3154984 http://www3.interscience.wiley.com/j...TRY=1&SRETRY=0 *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm