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. 2022 Mar 23;49(9):3247–3256. doi: 10.1007/s00259-022-05762-4

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© The Author(s) 2022

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Fig. 1 — Research process and inclusion of studies. Regarding the exclusion criteria, every paper was counted only once, since the exclusion criteria were applied stepwise. Abbreviations: RAI, radioactive iodine; SPM, second primary malignancy