“…A few interventions ( n = 3) (Ritterband et al, 2012 ; Spahrkäs et al, 2020b ; Urech et al, 2018 ; Zachariae et al, 2018 ) were studied in multiple countries. For more than half of the interventions ( n = 18), the study was performed only in breast cancer patients (Abrahams et al, 2015 ; Cairo et al, 2020 ; Delrieu, Anota, et al, 2020 ; Dozeman et al, 2017 ; Galiano‐Castillo et al, 2013 ; Henry et al, 2018 ; Holtdirk et al, 2020 ; Kapoor & Nambisan, 2020 ; Kelleher et al, 2021 ; Lee et al, 2014 ; Lengacher et al, 2018 ; Mendes‐Santos et al, 2019 ; Nápoles et al, 2019 ; Price‐Blackshear et al, 2020 ; Smith et al, 2019 ; van den Berg et al, 2012 ; Zachariae et al, 2018 ; Zhou et al, 2020 ), and in studies with mixed samples ( n = 14), a mean of 52% of the participants had breast cancer (Bray et al, 2017 ; Bruggeman‐Everts et al, 2017 ; Falz et al, 2021 ; Foster et al, 2016 ; Kubo et al, 2018 ; Mikolasek et al, 2021 ; Owen et al, 2017 ; Puszkiewicz et al, 2016 ; Spahrkäs et al, 2020b ; Urech et al, 2018 ; Willems, Bolman, et al, 2017 ; Yun et al, 2012 ; Zernicke et al, 2016 ). For three interventions, no percentage breast cancer patients was known yet, as only a protocol was available (Carlson et al, 2019 ; Corbett et al, 2016 ; Subnis et al, 2020 ).…”