Table 3.
Predisposing conditions
| Condition | No. of patients (%) |
|---|---|
| Smoking | 19 (20.9) |
| Upper respiratory infection | 7 (7.7) |
| Asthma | 3 (3.3) |
| Chronic obstructive pulmonary disease | 1 (1.1) |
| Drugs | 0 |
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