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Experts’ opinions on the usefulness of classifying postoperative complications following cardiac surgery (N=51).
| Usefulness | Results, n (%) |
| Extremely useful | 23 (45) |
| Very useful | 20 (39) |
| Moderately useful | 5 (10) |
| Slightly useful | 2 (4) |
| Not at all useful | 1 (2) |
