Europe Factors to Watch-Shares to dip on doubt about Fed's move

PARIS, Aug 7 (Reuters) - European stocks are seen falling on Wednesday, mirroring losses on Wall Street after comments from U.S. Federal officials raised doubts about when the central bank could start scaling back its stimulus measures. Chicago Fed President Charles Evans, typically among the most dovish policymakers, said the central bank will probably trim its bond buying programme later this year and could do so as early as next month, depending on the economic data. Another Fed offi