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Overview of modalities of the eHealth technologies. Some articles had used >1 device, resulting in 131 modalities within 101 articles.
| Modalities of the eHealth technology | Frequency, n (%) |
| Smart measurement and monitoring devices | 45 (34.4) |
| Smartphone | 26 (19.8) |
| Normal phone or landline | 16 (12.2) |
| Computer, laptop, or whiteboard | 16 (12.2) |
| Tablet | 15 (11.5) |
| Not mentioned | 9 (6.9) |
| Television | 3 (2.3) |
| Other | 1 (0.8) |
