Table 2 Search strategy for the MEDLINE (PubMed) database

1

"Diabetic Neuropathies"[Mesh]

2

"diabetic peripheral neuropath*"[Title/Abstract] OR "diabetic neuropath*"[Title/Abstract] OR "DPN"[Title/Abstract]

3

1 OR 2

4

"low-level light therapy"[MeSH Terms]

5

"Laser Irradiation, Low-Power"[Title/Abstract] OR "Irradiation, Low-Power Laser"[Title/Abstract] OR "Laser Irradiation, Low Power"[Title/Abstract] OR "Light Therap*, Low-Level"[Title/Abstract] OR "Low Level Light Therap*"[Title/Abstract] OR "Therap*, Low-Level Light"[Title/Abstract] OR "Photobiomodulation Therap*"[Title/Abstract] OR "Therap*, Photobiomodulation"[Title/Abstract] OR "Laser Therap*, Low-Level"[Title/Abstract] OR "Laser Therap*, Low Level"[Title/Abstract] OR "Low-Level Laser Therap*"[Title/Abstract] OR "Low Level Laser Therap*"[Title/Abstract] OR "Low-Power Laser Therap*"[Title/Abstract] OR "Low Power Laser Therap*"[Title/Abstract] OR "Laser Therap*, Low-Power Laser Therap*, Low Power"[Title/Abstract] OR "Low-Power Laser Therap*"[Title/Abstract] OR "Low-Power Laser Irradiation"[Title/Abstract] OR "Low Power Laser Irradiation"[Title/Abstract] OR "Laser Biostimulation"[Title/Abstract] OR "Biostimulation, Laser"[Title/Abstract] OR "Laser Phototherapy"[Title/Abstract] OR "Phototherapy, Laser"[Title/Abstract] OR "low intensity laser therap*"[Title/Abstract] OR "low energy laser therap*"[Title/Abstract] OR "LLLT"[Title/Abstract] OR "LILT"[Title/Abstract] OR "LELT"[Title/Abstract]

6

4 OR 5

7

3 AND 6

8

3 AND 6 Filters: Randomized Controlled Trial; Humans