LEI, Chen et al. Hand Washing as a Preventive Factor for a Chickenpox Outbreak in a Rural School, Yunnan Province, China. OSIR Journal, [S.l.], v. 5, n. 1, p. 7-13, nov. 2016. ISSN 2651-1061. Available at: <http://www.osirjournal.net/index.php/osir/article/view/63>. Date accessed: 25 sep. 2022.