Is it convenient to talk at the moment? <a href=" http://www.ashr.edu.au/viagra-ambien-online.pdf#elder ">groene viagra pillen</a> Some corporate investigators in China had worked with short-sellers and hedge funds doing research on those companies, said Paul Gillis, professor at Peking University's Guanghua School of Management. It is unclear if the recent detentions are related to that work. Short-sellers borrow shares, sell them in the expectation that their price will fall and then buy them back at a lower price.