Stories behind the lens: Photographer documents medics in Wuhan

Wuhan might have said goodbye to the last medical assistance team to leave the city one week ago, but it won't forget the medics, who helped it, any time soon. A team of photographers from all over China took more than 42,000 portraits of the medical professionals working there, and some of the images debuted in a documentary titled "Witness." CGTN's Xu Mengqi talks to the lead photographer about those pictures and the stories behind.