Three city hospitals have reached tentative contract agreement with nurses, avoiding a planned strike against understaffing, according to a New York State Nurses Association representative.On Dec. 31, roughly 16,000 nurses spread across eight city hospitals including NewYork-Presbyterian, Montefiore Medical Center, Mount Sinai Hospital, Mount Sinai Morningside and West, Maimonides Medical Center, BronxCare Health Systems, Richmond University Medical Center and Flushing Hospital Medical Center delivered ten-day strike notices to their hospitals to protest against staff shortages causing risk to nurses and patients.