NEW YORK (AP) — Nurses at a big New York hospital system approved a new contract Saturday, voting to end a major nursing strike after more than a month. More than 4,000 nurses in the privately run NewYork-Presbyterian system went on strike Jan. 12. They are now due to start returning to work in the coming week. The union, called the New York State Nurses Association, said 93% of its members at NewYork-Presbyterian voted to ratify the three-year contract. Two other big private hospital systems,