Comparative characteristics of selenium content in students from different regions of the worldIrina A. Kovaleva, Denis A. Oreshnikov, Victoria A. Gefter, Igor A. Orkin, Deiby H. Ojeda Amaya, Andrey S. Kritchenkov and Anatoly A. KirichukE3S Web Conf., 555 (2024) 02007DOI: https://doi.org/10.1051/e3sconf/202455502007