<a target=_blank class=ftalternatingbarlinklarge href="http://forums.cysticfibrosis.com/messageview.cfm?catid=1151&threadid=25772&highlight_key=y">Link</a> Here's an old post on here from about 9 months ago that asked that question - I didn't go through the whole post but I think LouLou had some answers about it.