Global effect of COVID-19 pandemic on physical activity, sedentary behaviour and sleep among 3- to 5-year-old children: a longitudinal study of 14 countries.
BMC Public Health. 2021 May 17;21(1):940. doi: 10.1186/s12889-021-10852-3.
BMC Public Health. 2021.
PMID: 34001086
Free PMC article.