Collect data on immigration epidemiology.

1. Collect general information of immigrants, such as gender, age, occupation, time and place of birth, records of living place in one's life, nationality and change, nationality, religion, language, social status and economic status, and information of parents.

2. Collect indicators related to genetic factors, such as the incidence and death of relatives, clinical and biochemical test results, etc. , collect genealogy charts if necessary.

3. Collect environmental indicators, such as food, living habits (smoking, drinking, etc. ) and other environmental indicators. Pay special attention to environmental factors that change with time.

4. Collect data on disease frequency and immigrant population.