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. 2020 Oct 1;6(10):e05141. doi: 10.1016/j.heliyon.2020.e05141

Figure 1.

Figure 1

Evolution in the number of documents on population surveillance (2000–2017∗) and retrieved from the Web of Science Core Collection databases. ∗The documents published in 2018 (n = 2578) and 2019 (n = 1160) were not included in the figure due to the delay in the assignment of descriptors and in the updating of the databases; thus for these years, data were incomplete at the time of the bibliographic search.