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The risk of type Ia or IIs endoleak formation was calculated with a fitted logistic regression curve according to length of bird-beak configuration. Curve shows that risk for type Ia or IIs endoleak increases as bird-beak length increases, reaching a risk of more than 50% at a length of 10 mm and a risk of more than 80% at a length of 15 mm. ◇ = observations.
