“12 | Hexavalent and Measles-Mumps-Rubella Vaccines: Analysis of Administration Timing in the 2022–2025 Birth Cohorts Within the Local Health Authority of Catania”. Journal of Biological Research - Bollettino Della Società Italiana Di Biologia Sperimentale, vol. 99, no. s3, Aug. 2026, https://doi.org/10.4081/jbr.2026.16140.