| form the basis | 0.56 |
| last 2-4 hours | 0.41 |
| occur in virtually all … | 0.38 |
| occur in the presence o… | 0.25 |
| last | 0.25 |
| death | 0.29 |
| countered with naloxone | 0.64 |
| balanced with potential… | 0.60 |
| produced by morphine | 0.60 |
| assessed | 0.58 |
| studied for many years | 0.56 |
| offset by increased rat… | 0.49 |
| felt | 0.48 |
| countered with naltrexo… | 0.32 |
| observed | 0.26 |
| reduced with increasing… | 0.25 |
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