Table 4. Number of vibrations.
| Vibration number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | n/aa |
| Paper number | 2 | 38 | 22 | 8 | 8 | 11 | 1 | 4 | 1 |
a “n/a” refers to the paper that did not report the number of vibrations.
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