U.S. RESEARCH ROUNDUP-Aflac, St. Jude Medical, Gap

May 10 (Reuters) - Wall Street securities analysts revised their ratings and price targets on several U.S.-listed companies, including Your Community Bankshares, Kohls and Nordic American Tanker, on Tuesday. HIGHLIGHTS * Aflac Inc : FBR cuts to market perform rating * Sprouts Farmers market Inc : Goldman Sachs cuts to sell from neutral * Hasbro Inc : Piper Jaffray cuts to neutral from overweight * St. Jude Medical Inc : SunTrust