History of using medical facilities  (Purpose) Identify the clinical symptoms and date of initial onset of symptoms of the patient Obtain medical records and evaluate the date of onset of symptoms  Obtain objective data about the clinical symptoms of the patient
Specify medical facilities that were visited during the time of exposure  Long time needed to review the medical records
If there are no related symptoms because the medical facilities were visited for a different illness, it is impossible to obtain related information  National Health Insurance Corporation Health Insurance Review and Assessment Service