Brent crude edges up, but concern over demand limits gains

LONDON (Reuters) - Oil prices edged up on Monday after evidence that a recent fall to 15-month lows may be affecting output in the United States, the world's largest producer, although concern about the outlook for demand tempered gains.Brent crude futures were up 12 cents at $53.94 a barrel by 0858 GMT, while U.S. crude futures lost 3 cents to $45.56.Brent fell 11 percent last week and hit its lowest since September 2017, while U.S. futures slid to their lowest since July 2017, bringing the..