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. 2021 Aug 13;33(22):15091–15118. doi: 10.1007/s00521-021-06406-8

Table 4.

Distribution of publications per year

Year Number of studies Publications in percentage
2015 15 7%
2016 20 10%
2017 25 12%
2018 30 15%
2019 35 18%
2020 45 23%
2021 30 15%
Total 200 100%