New York City nurses on strike say they’ve restarted contract talks with another one of the major hospital systems affected on the fifth day of the walkout. The New York State Nurses Association said Friday that its bargaining team has begun meetings with their counterparts at three Mount Sinai hospitals on Friday. The union met Thursday night with NewYork-Presbyterian administrators but both sides said the lengthy meeting ended with little progress made to end the city’s biggest strike of its kind in decades. Negotiations still have not resumed with Montefiore, the third major hospital system impacted. Each medical center is negotiating with the union independently.