Based on the epidemiological evidence and exposure to particularly hazardous works, the incubation period for some occupational diseases may range from 10 to 30 years. Hence, in order to enhance the protection of labor’s right to health, labors who have engaged in harmful work as specified in Paragraph 2 of Article 2 of the “Guidelines on Occupational Disease Prevention Health Examination and Health Tracking Examination for Labor Occupational Accident Insurance” and who have been insured for one year in a row, for labors who change the works, resign, or withdraw the insurance, the insured unit or the labor him/herself may apply to the Bureau for occupational disease prevention tracking examination, and may apply for such examination once a year.