| Cases number (n) | % |
Myerson A | 4 | 19.05 |
Myerson B1 | 5 | 23.81 |
Myerson B2 | 6 | 28.57 |
Myerson C1 | 4 | 19.05 |
Myerson C2 | 2 | 9.52 |
Total | 21 | 100 |