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Studies classified by sensor type (N=72).
| Sensor type | Studies, n (%) |
| Body-worn sensor technology | 25 (35) |
| Marker-based motion capture system | 24 (33) |
| Marker-free vision sensor | 16 (22) |
| Physiological signal sensing technology | 10 (14) |
| Sensors embedded in rehabilitation training system | 8 (11) |
| Ambient sensor | 5 (7) |
