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| Study name | To evaluate the effect on retention of sending Christmas cards to trial participants. |
| Methods | To evaluate the effect on retention of sending Christmas cards to trial participants. |
| Data | |
| Comparisons | Intervention 1: Christmas card to the trial participant. Intervention 2: no Christmas card. |
| Outcomes | Primary: number of participants retained. Secondary: cost per participant retained. |
| Starting date | |
| Contact information | streweek@mac.com |
| Notes |
