Actually, we are very good designing questionnaire includes various kinds of detail records. The problem is how we can use it.

Public health staff should filter the data reported which means they should not trust completely all the data reported, that is to say, they should have their own judgment.

Concerned with long term research, we have many things to study. However, we should choose a small aspect when doing a specific research. We should also choose proper time and distinguish first and second assignment in order not to intervene rescue.