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Common features and differences between phase 1 and phase 2.
| Issues | Phase 1 | Phase 2 |
| Evaluation focus | Drugs and adverse events entity recognition | Adverse drug reaction relationships recognition |
| Gold standard (manual annotations) | Not blind | Blind |
| Gold standard annotators | Pharmacovigilance experts | Experts in medical terminologies |
| Interannotator agreement | No | Yes |
| Granularity issue | No | Yes |
| Sentence boundary issue | No | Yes |
