means by which the trial was submitted to the CTRP:
- Batch: Trials submitted via the NCI CTRP Registration Batch Upload site
- ClinicalTrials.gov: Trials imported from ClinicalTrials.gov
- Grid Service: Trials submitted via the NCI CTRP web services
- PDQ: Trials submitted via the NCI Physician Data Query database
- Registry: Trials submitted via Registration
- REST Service: Trials submitted via NCI CTRP Registration REST Service
- Other: Trials submitted via any method other than those listed above
