Fig. 1

Flowchart of study inclusion. Non-qualitative studies were excluded. Studies that did not contain patients with CKD, or were mixed with other participants and of which the data were not linkable to patients with CKD were marked as ‘wrong population’. Studies that did not contain extractable data (e.g. systematic reviews), but were qualitative and included patients with CKD were marked as ‘wrong study design’. The inclusion and labelling method is described in more detail in Supplement Item 1