“…The publications were conducted as cohort ( n = 15, [ 24 , 25 , 31 , 34 , 35 , 37 , 41 , 43 , 45 , 48 , 50 , 52 , 55 , 71 , 73 ]), cross-sectional ( n = 7, [ 29 , 30 , 39 , 42 , 49 , 53 , 54 ]) or retrospective studies ( n = 4, [ 33 , 40 , 51 , 72 ]). The majority were carried out in spring/summer 2020 ( n = 18, [ 24 , 25 , 30 , 31 , 33 , 34 , 37 , 40 – 43 , 48 , 51 – 53 , 55 , 71 , 72 ]) or winter 2020/2021 ( n = 6, [ 29 , 35 , 39 , 45 , 49 , 73 ]). In 24 publications, the period during the pandemic was classified as ‘full lockdown’ (Oxford COVID-19 Stringency Index > 60, [ 24 , 25 , 29 – 31 , 33 – 35 , 37 , 39 – 43 , 45 , 48 – 53 , 55 , 71 , 73 ]).…”