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. 2021 Apr 1;31(5):967–979. doi: 10.1007/s00590-021-02957-7

Fig. 2.

Fig. 2

Risk of bias summary. graphic file with name 590_2021_2957_Figz_HTML.jpg Low risk of bias, graphic file with name 590_2021_2957_Figy_HTML.jpg high risk of bias, and graphic file with name 590_2021_2957_Figx_HTML.jpg unclear risk of bias