Oil slips on doubts that output cut will be deep enough to end glut

By Henning Gloystein SINGAPORE (Reuters) - Oil prices slipped on Wednesday on persistent doubts whether a planned crude production cut led by OPEC and Russia would be deep enough to end a supply overhang that has dogged markets for over two years. International Brent crude futures were at $53.82 per barrel at 0608 GMT, down 11 cents, or 0.2 percent, from their last close. Oil prices shot up as much as 19 percent after the Organization of the Petroleum Exporting Countries (OPEC) and Russia last w