Table 2.
Literature research category table.
| Research category | Number of documents | Percentage (%) |
|---|---|---|
| Array research | 11 | 20.8 |
| Cross-sectional study | 13 | 24.5 |
| Case crossover study | 7 | 13.2 |
| Time series research | 3 | 5.7 |
| Inhaled glucocorticoid research | 19 | 35.8 |
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