Reference:
1. Firestone M.J., Hedberg C.W. (2018). Restaurant inspection letter grades and Salmonella infections. Emerging Infectious Disease, 24(12). DOI: 10.3201/eid2412.180544
2. Jones, T. F., Pavlin, B. I., LaFleur, B. J., Ingram, L. A., & Schaffner, W. (2004). Restaurant inspection scores and foodborne disease. Emerging Infectious Diseases, 10(4), 688.
3. New York City Department of Health and Mental Hygiene.(2010). Chapter 23: Food Service Establishment Inspection Procedures. Retrieved from: https://www1.nyc.gov/assets/doh/downloads/pdf/about/healthcode/health-code-chapter23.pdf