DUBAI, Jan 18 (Reuters) - Here are some factors that may affect Middle East stock markets on Sunday. Reuters has not verified the press reports and does not vouch of their accuracy.INTERNATIONAL/REGIONAL* GLOBAL MARKETS-Stocks rally on U.S. data, euro slides further MKTS/GLOB* Oil closes up for first week in eight after supportive reports O/R* MIDEAST STOCKS-Gulf mixed; poor Q4 results weigh on Sa