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Likert scale for rating the visualization of the corresponding anatomical landmarks
| 5–Very good | Complete visualization without additional maneuvers |
| 4–Good | Good visualization without additional maneuvers |
| 3–Satisfactory | Good visualization due to additional maneuvers |
| 2–Sufficient | Visualization possible only to a limited extent despite additional maneuvers |
| 1–Poor | Visualization not possible despite additional maneuvers |
