“…They were conducted primarily in the WHO Western Pacific (9 studies [ 24 , 26 , 35 , 37 , 42 , 55 , 56 , 58 , 64 ]) and European (8 studies [ 23 , 28 , 30 , 31 , 38 , 44 , 53 , 62 , 65 ]) Regions. Data were collected using authors’ questionnaires/during anamnesis in the case of 8 studies, and using validated questionnaires: renal version of the Patient Outcome Scale—symptom module (POS-S Renal; 5 studies [ 24 , 27 , 31 , 35 , 64 ]); Integrated Palliative Care Outcome Scale (IPOS)-Renal (3 studies [ 26 , 37 , 39 ]); Dialysis Symptom Index (DSI) (3 studies [ 23 , 53 , 57 , 58 ]); Memorial Symptom Assessment Scale–Short Form (MSAS-SF; 2 studies [ 44 , 62 ]).…”