U.S. stocks closed lower on Thursday with the main indexes weighed down by losses in health-care and utility shares. Volatile oil prices also put pressure on energy shares. The S&P 500 declined 3.93 points, or 0.2%, to 2,381.33. The Nasdaq Composite , after briefly trading above its previous closing high, gave up gains, to finish virtually unchanged, at 5,900.76. The Dow Jones Industrial Average slipped 16.30 points or less than 0.1%, to 20,933.80.
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