GLOBAL MARKETS-Shares mixed ahead of Greek debt meeting; oil slips

* U.S. shares pause before euro zone meetings on Greece * European shares slip * Oil slips; dollar firms * U.S. bond yields edge higher * Gold hits one-month low (Adds U.S. markets open, changes byline, dateline; previous LONDON) By Sam Forgione NEW YORK, Feb 11 (Reuters) - U.S. stocks stalled their advance and European shares stumbled on Wednesday ahead of a showdown between Greece's finance minister and euro zone finance ministers over the country's debt, while oil pr