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Imtiaz S, Nafeh F, Russell C, Ali F, Elton-Marshall T, Rehm J. The impact of the novel coronavirus disease (COVID-19) pandemic on drug overdose-related deaths in the United States and Canada a systematic review of observational studies and analysis of public health surveillance data. Subst Abuse Treat Prev Policy. 2021;16(1)87. https//doi.org/10.1186/s13011-021-00423-5 Monitoring PopulationLevel Physical Activity in Adolescents and Adults Namibia Nashandi et al. validated a selfreport questionnaire by comparing it to an accurate device-based method to assess moderate to vigorous physical activity (MVPA) among adolescent girls (n = 52) and women (n = 51) in Namibia. BMC Public Health. 2021;21(1)1750. https//doi.org/10.1186/s12889-021-1 1765-x Automated Syndromic Surveillance in Communities Taiwan Chan et al. describe a surveillance system to serve as a sentinel for infectious disease outbreaks in Taipei City, Taiwan, using data from primary care clinics and community hospitals and incorporating spatiotemporal information.