(Reuters) - Troubled hospital operator NMC Health on Monday said it requested London Stock Exchange to delist its shares after they remained suspended for two months. The UAE-based company was placed into administration earlier this month, on the application of one of its biggest lenders, as NMC revised its debt position to $6.6 billion, well above earlier estimates.NMC, which has also faced troubles over the shareholdings of its top investors, was booted from the UK's blue-chip FTSE 100 index ..