Heffelfinger, J. D. “Mass Psychogenic Illness and Immunization Stress-related Responses: Rapid and Appropriate Management are Critical”. Outbreak, Surveillance, Investigation & Response (OSIR) Journal 18, no. 4 (December 31, 2025). accessed October 4, 2026. https://he02.tci-thaijo.org/index.php/OSIR/article/view/280884.