China is reporting big successes in the coronavirus fight. Should we trust the numbers?

China has reported fewer and fewer confirmed coronavirus cases over the past three weeks, culminating in a statement that Wuhan had seen zero new local cases for four days in a row, from March 18 to 21. Elsewhere in China, 46 new cases were reported on March 22, all but one attributed to travelers arriving from abroad.

What can we learn from Chinese statistics, and can we trust those numbers?