Table 1.

Characteristics of the papers included in the review.

Total number of papers included in this review	66
Type of paper (%)
Case series	30 (45.5)
Case-controlled study	7 (10.6)
Randomised controlled trial	29 (43.9)
Mean number of patients with painful neuropathy, per paper (SD)	125.1 (122.5)
Male to female ratio	1 : 1
Aetiology of polyneuropathy, number of papers (%)
Chronic idiopathic axonal	2 (3.0)
Chemotherapy-induced	4 (6.1)
Diabetic	47 (71.2)
Genetic	1 (1.5)
Gluten	1 (1.5)
HIV	3 (4.5)
Immune-mediated	1 (1.5)
Multiple aetiologies	6 (9.1)
Sarcoidosis	1 (1.5)
Number of publications per decade
Until 2000	3 (4.5)
2000–2009	16 (24.2)
2010–2018	47 (71.2)