HONG KONG (Reuters) - Dozens of former SARS patients in Hong Kong are suffering from bone degeneration, known as avascular necrosis, sources said Friday, throwing the spotlight back on the controversial cocktail of drugs used to treat many patients during the epidemic. "A substantial number of cases have already been proven. We are now trying to ascertain the severity," said Leung Ping-chung, an orthopedics specialist at the Prince of Wales Hospital, where the first wave of SARS infections in Hong Kong were treated. Almost all SARS patients in Hong Kong were treated with the anti-viral drug ribavirin and steroids earlier...