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See Link No. 311 http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=550347&blobtype=pdfand Link No. 312 http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=437626&blobtype=pdfI don't suppose that any backyard grower will be rushing out to do this, but it is interesting that it can be done.
Thanks for the info!