Wall St ends flat

U.S. stocks closed flat amid concerns as investors remain on sidelines ahead of a busy corporate earnings weak.
Dow Jones Industrial Average gained 18.89 points, or 0.14 per cent at 13,507.32.
S&P 500 erased 1.37 points, or 0.09 per cent to end at 1,470.68.
Nasdaq fell 8.13 points, or 0.26 per cent to 3,117.50.
Among key S&P sectors, healthcare stocks gained, while telecom shares dropped.