(a).
| Type I | Type II | Type III | Extrinsic obstruction | |
|---|---|---|---|---|
| 2004–2009 Group 1: open approach (n = 10) | 3 | — | 5 | 2 |
| 2009–2015 Group 2: mininvasive approach (n = 8) | 1 | — | 5 | 2 |
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