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Four Study Groups in the 2 × 2 Factorial Trial
| Surgeon Group | ||
| Usual Care | Patient Preference Report | |
| DA group | ||
| Long | Group 1: patients receive long, detailed DA; surgeon does not receive report | Group 2: patients receive long, detailed DA; surgeon receives report |
| Short | Group 3: patients receive short, interactive DA; surgeon does not receive report | Group 4: patients receive short, interactive DA; surgeon receives report |
