What is the chance of having a second wave of the pandemic/outbreak if Chinese government were to lift preventive measures? 

According to the CNN, potential coronavirus second wave has China on high alert. As the number of novel coronavirus cases slows to a trickle within China but continues to soar outside, Chinese authorities are stepping up measures to prevent a surge in cross-border infections.

Link: https://edition.cnn.com/videos/world/2020/03/20/coronavirus-outbreak-pandemic-china-high-alert-second-wave-culver-pkg-intl-ldn-vpx.cnn/video/playlists/coronavirus-intl/