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| 1st surgery | 2nd surgery | |||
|---|---|---|---|---|
| Number of animals | Bile duct ligation | Sham operation | Balloon dilatation of the left carotid artery | |
| AA group | 8 | 5 | 3 | 4 |
| O2 group | 12 | 6 | 6 | 0 |
