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Summary of participant characteristics
| n | |
| Number of studies included in this review | 16 |
| Number of participants identified in the studies | 2967 |
| Disease etiology | |
| Unspecified | 118 |
| Idiopathic | 1850 |
| Diabetic | 761 |
| Post-surgical | 198 |
| Other (e.g., connective tissue disorder, Parkinson’s disease) | 151 |
| Gender | |
| Female | 2434 |
| Male | 533 |
| Mean age | 44.6 |
