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The number of hits in PubMed as of 30 June 2022, per radionuclide and year of publication. The radionuclides have been separated according to the aggregated numbers of publications across panels (a–c). The radionuclides with fewer than 13 hits total have been aggregated into “Others” and are listed to the right in the figure. The search strategy and search strings are described in Supplementary File S1.
