Fernández Nieto, M.I., Valero Cedeño, N.J., Álava Zambrano, D.N. and Hidalgo Ramirez, K.J. 2021. Demographic and epidemiological aspects associated with immunity to the hepatitis B virus in university students in the health area. Kasmera. 49, Supl 1 (Sep. 2021), e49S135705. DOI:https://doi.org/10.5281/zenodo.5520696.