Medline has a couple

papers.
Two pushing the

stuff:
http://www.ncbi.nlm.nih.gov/entrez/q...<br /> <br />
http://www.ncbi.nlm.nih.gov/entrez/q...<br /> <br />
And one mentioning toxic contaminants in some

samples:
http://www.ncbi.nlm.nih.gov/entrez/q.../> <br /> 85