“…Numerous tools have been implemented to explore experiences of pain, from unidimensional tools (e.g. visual analogue scales (VAS) (Janssen et al, 2011), numeric rating scales (Bentsen et al, 2012(Bentsen et al, , 2013 and the Memorial Symptom Assessment Scale) (Blinderman et al, 2009;Eckerblad et al, 2014) to multiple dimensional pain questionnaires, including the Brief Pain Inventory (BPI) (Lohne et al, 2010;Bentsen et al, 2011;Borge et al, 2011;HajGhanbari et al, 2012HajGhanbari et al, , 2013HajGhanbari et al, , 2014Christensen et al, 2016;Lee et al, 2017) and McGill Pain Questionnaire (MPQ) (HajGhanbari et al, 2012(HajGhanbari et al, , 2014. Therefore, variability in participants' characteristics and measurement tools may have contributed to the varied prevalence of pain among studies that investigated this symptom in individuals with COPD.…”