Skip to main content
. Author manuscript; available in PMC: 2020 Jun 1.
Published in final edited form as: J Pain Symptom Manage. 2019 Dec 20;59(6):1320–1343. doi: 10.1016/j.jpainsymman.2019.12.358

Fig. 1. Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram of articles assessed for inclusion.

Fig. 1.

HF = heart failure; COPD = chronic obstructive pulmonary disease; CKD = chronic kidney disease; MS = multiple sclerosis; RA = rheumatoid arthritis; CASP = Critical Appraisal Skills Program.