This is probably under reported but it does happen
www.sciencedirect.com/science_ob=ArticleURL&_
udi=B6W90-4FSK6D3-3&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_
acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=
b988edf3fd88e668452006660a11abd3
Pat
