Registered Nurses, members of the Maine State Nurses Association and National Nurses Organizing Committee /National Nurses United -- the largest union and professional association of registered nurses in the country, with 175,000 members -- will hold a press conference in front of Spectacular Events in Bangor on Tuesday, July 10 at 9:30 am, to call attention to the proposed sale of Eastern Maine Medical Center’s dialysis services to DaVita Inc., the nation’s largest for-profit dialysis provider.