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. 2021 Nov 16;52(1):22–35. doi: 10.1007/s00595-021-02406-2

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© The Author(s) 2021

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Fig. 2 — Weekly volume of five procedures according to the three groups (high, medium, low) of regional infection level. Shaded areas show the periods of the first and second pandemic waves (February 26-May 26, and July 1-September 29, respectively)