Which of the following is TRUE about Kiyoshi Shimamura‘s investigation as stated in the passage?

* Hướng dẫn giải

Dẫn chứng: He noticed an increase in dog bites a short time before earthquakes hit. Then, he did an investigation of twelve public health centers in Kobe, Japan. These health centers treated people after a big earthquake. Shimamura noticed that the month before the big earthquake, treatment for animal bites had increased.