| Time (months) | 1–3 | 4–6 | 7–9 | 10–12 | |
|---|---|---|---|---|---|
| Group 1 | Hospital 1 | O | X | X | X |
| 2 | O | X | X | X | |
| 3 | O | X | X | X | |
| Group 2 | 4 | O | O | O | X |
| 5 | O | O | O | X | |
| 6 | O | O | O | X |
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