Development of the health-preserving competence of a physical education teacher based on the knowledge about influenza and bronchitis preventionVasyl M. Fedorets, Mykola B. Yevtuch, Oksana V. Klochko, Nina P. Kravets and Roman S. GrynyovSHS Web Conf., 104 (2021) 02006DOI: https://doi.org/10.1051/shsconf/202110402006