Oil prices edge lower amid doubts over OPEC output cut

By Jane Chung and Keith Wallis SEOUL/SINGAPORE (Reuters) - Oil prices gave up some early gains to turn lower in Asian trade on Thursday on mixed U.S. crude stocks data and doubts over OPEC's implementation of an output cut, although a weaker dollar put a floor under prices. International Brent crude futures were trading down 16 cents at $52.84 a barrel at 0659 GMT from their last close. Crude oil inventories in the United States dropped 2.4 million barrels in the week that ended on Dec. 2, compa