(Reuters) - NMC Health said on Thursday trading in its shares on the London bourse has been suspended, a day after the UAE healthcare firm removed its top boss and granted its finance chief an extended sick leave as details of an investigation into the company emerged.Abu-Dhabi based NMC's shares have lost about two thirds of their value since U.S.-based short-seller Muddy Waters late last year questioned its financial statements."The company is focused on providing additional clarity to the..