Genevieve, Could you please share the citation with the list? I am very interested in obtaining this article, or similar information. [Does anybody know whether it is available anywhere online, or whether S.A. allows one to order back issues?] Thanks! *********************************************** The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(TM) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html