coronavirus, two Chinese filmmakers strapped on hazmat suits and embedded themselves in Wuhan's overrun hospitals.There, they captured harrowing footage of terrified citizens hammering on hospital doors, medics collapsing from exhaustion, and relatives begging in vain to say goodbye to infected loved ones.Now, those images have been edited together by New York-based director Hao Wu ("People's Republic of Desire").Premiering at the Toronto film festival Monday, "76 Days" -- named for the duration of the central Chinese city's draconian lockdown -- is the first major documentary from the disease's original epicenter to hit theaters.Shot in a claustrophobic, cinema verite style -- without voice-over or direct-to-camera interviews -- the film.