Une, C., Malespín Bendaña, W., Ramírez-Mayorga, V., Rosero Bixby, L. and Sierra Ramos, R. 2022. Helicobacter pylori infection and serum pepsinogen concentrations in an elderly population representative of Costa Rica. Población y Salud en Mesoamérica. 19, 2 (Jan. 2022). DOI:https://doi.org/10.15517/psm.v19i2.49405.