Ghaffarinejad, K., Razaghi, N., & Sadeghi, T. "The Effect of the Helfer Technique in the Facilitated Position on Pain Caused by Hepatitis B Vaccine Injection in Term Infants: A Randomized Clinical Trial", Journal of Pediatric Perspectives, 14, 3, 2026, 19951-19965. doi: 10.22038/jpp.2026.95093.5637