| Author, date, and country | Patient group | Study type (level of evidence) | Outcomes | Key results | Study weaknesses |
|---|---|---|---|---|---|
| Farragher D et al, 1987 | 40 patients. with a 74 months mean interval between onset and starting treatment. | Clinical trial | FPRP (Facial Paralysis Recovery Profile) | p<0.0001 | Not randomised |
| Stimulation v no stimulation | FPRI (Facial Paralysis Recovery Index) | p<0.0001 |