Professor Yves Catonne arrives at Los Angeles international airport, December 14, 2009, to assess the health of French rock star Johnny Hallyday and determine whether he will be fit enough to resume his farewell tour. Hallyday had surgery at the Cedars-Sinai hospital where he was admitted on December 7, 2009, his publicists said. Hallyday, one of France's most popular entertainers in a career spanning almost 50 years, has been suffering health problems recently. REUTERS/Benoit Tessier (UNITED STATES - Tags: ENTERTAINMENT HEALTH SOCIETY)