| 1 | Built environment | 6638 |
| 2 | aging | 666,599 |
| 3 | #1 AND #2 | 216 |
| 4 | Physical activity OR walkability | 424,281 |
| 5 | #3 AND 4 | 93 |
| 6 | [systematic review]/lim OR [meta analysis]/lim | 279,440 |
| 7 | #5 AND #6 | 2 |
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