Some words of wisdom here:
http://books.google.com/books?id=pAOFt1znYr8C&pg=PA565&sig=dxXcrMF27BuQIKZoupC4EPvaFJU
If you scroll there is a lot of info there
http://books.google.com/books?id=pAOFt1znYr8C&pg=PA565&sig=dxXcrMF27BuQIKZoupC4EPvaFJU
If you scroll there is a lot of info there