Hadzhiyski, P.; Baycheva, M.; Shentova-Eneva, R.; Kofinova, D.; Markovska, R.; Mitov, I.; Boyanova, L. Role of Extended Family for Intrafamilial Transmission of Helicobacter Pylori Infection in Bulgarian Children. C. R. Acad. Bulg. Sci. 2023, 76, 1762–1767.