“…The selection process of EMA items was guided by previous qualitative research on the patients' perspective on CCRF, group-level network studies on CCRF, and clinical expertise in treating patients with CCRF ( Bootsma et al, 2021a , Bootsma et al, 2021b , Bootsma et al, 2020 ; Bruggeman-Everts, 2019 ; Schellekens et al, 2020 ; Wolvers et al, 2021 ). We selected items that we expected to vary momentarily and measured the experiences and responses to CCRF: fatigue-related symptoms, positive and negative mood, activity, coping with fatigue, and context ( Table A.1 ).…”