Chinese doctors in Wuhan's Tongji Hospital shared their experience with COVID-19 control with their counterparts in Italy in a teleconference on March 4. With over 4,000 confirmed COVID-19 cases by March 6, Italy is now the worst-hit European country by the virus.

It's not just Italian doctors reaching out to Wuhan colleagues for help. Earlier this week, a hospital in New York City contacted doctors at Chengdu's West China Hospital for help, as the latter has been fighting the outbreak in Wuhan for more than a month.