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There are still a lot of patients infected with the novel coronavirus (2019-nCoV) in Wuhan who have not yet been hospitalized, and this is the most pressuring challenge for the epicenter of the virus outbreak, according to one expert. The flow of these patients, usually with a mild condition, has been the top factor aggravating the situation in Wuhan, Wang Chen, dean of the Chinese Academy of Medical Sciences who has been in the city for several days, told CCTV in an exclusive interview on Wednesday evening.