Let the hospital give you a certificate first, and it is best to contact the government departments in that area, such as the county government. If you can get some support from the higher government, your research will go smoothly.

Be sure to find out what you need to investigate and what you should ask if you want to communicate with others before the investigation.

Some problems are difficult to reflect at once in the process of investigation. You can talk to the locals alone, don't ask too bluntly.