Registered nurses at Osceola Regional Medical Center in Kissimmee voted by 92 percent Monday night to join the National Nurses Organizing Committee-Florida, an affiliate of National Nurses United. In a press release, Charles Idelson, communications director for National Nurses United, said that in a secret ballot election conducted by the National Labor Relations Board, the federal agency that oversees labor relations, the local registered nurses voted 354-30 to join the country's biggest union and professional association of registered nurses.