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Possible sampling strategy by cognitive status
| Participant group | Time period | ||
|---|---|---|---|
| T1 | T2 | T3 | |
| Cognitively unimpaired | Normal cognition | Normal cognition | Normal cognition |
| Cognitively impaired, at least at 1 time point | Normal cognition | Normal cognition | Cognitive impairment |
| Normal cognition | Cognitive impairment | Cognitive impairment | |
| Cognitive impairment | Cognitive impairment | Cognitive impairment | |
