NMC Health's vice chairman quits as further shareholder twists emerge

(Reuters) - NMC Health is still trying to unravel details about the holdings of the company's top investors, it said on Friday after announcing that one of its controlling shareholders had resigned from the board.The largest private healthcare provider in the United Arab Emirates is listed in London on the blue-chip FTSE 100 index but has come under increasing pressure after shareholder Muddy Waters raised questions over its finances, prompting major investors to sell out, sending its share..