Registered nurses at Upland, PA-based Crozer-Chester Medical Center are calling for a strike if negotiations with management fail to produce a new contract. The nurse's present deal expires at June 4, and they have called for a three-day strike beginning June 5 if a deal is not reached. The nurses are seeking improved nurse-to-patient ratios, and are seeking resolutions to economic issues such as recruitment and retention of nurses, pension benefits, and healthcare costs.