Study Shows European Banks Exposed To Credit Derivatives By Jeff Coelho OF DOW JONES NEWSWIRES LONDON (Dow Jones)--The swelling growth in the number of European banks using credit derivatives to enhance revenue calls for more accounting transparency, as less-experienced financial institutions could be at risk, rating agencies and analysts said Monday. Fitch Ratings said the preliminary results from its new study of a broad cross section of global financial institutions showed about three-quarters of European banks surveyed were net sellers of protection through credit derivatives. German banks, particularly the state Landesbanken, were largely involved as net sellers of protection, showing...