Gold and silver prices pulled back slightly Wednesday as traders took profits following a three-month surge as the dollar weakened against the euro. Traders are also in wait-and-see mode ahead of the European Central Bank meeting Thursday, when it's expected to announce a stimulus plan. SPDR Gold Shares (GLD) shed 0.26% in low volume. PowerShares DB U.S. Dollar Index Bullish (UUP), measuring the dollar against a basket of foreign currencies, shed