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(c):
| Institutional Credentialing Requirements | N/Ntotal (%) |
|---|---|
| Institutional credentialing | |
| No | 24/42 (57.1%) |
| Yes | 18/42 (42.9%) |
| Credentialing componentsa | |
| Phantom analysis | 15/18 (83.3%) |
| Facility questionnaire | 15/18 (83.3%) |
| Knowledge assessment | 13/18 (72.2%) |
| Radiation source registration | 3/18 (16.7%) |
| Treatment planning system verification | 2/18 (11.1%) |
Percentage breakdown in this category was based on the number of trials which required institutional credentialing.
