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Detail of patients withdraw.
| Reasons | Traditional group (n=10) | WeChat group (n=3) |
|---|---|---|
| Pregnant | 2 | 0 |
| Death (car accident) | 1 | 0 |
| Unable to finish bronchial provocation test | 2 | 0 |
| Unable to attend | 2 | 1 |
| Diagnosed with cancer | 0 | 1 |
| Lost contact | 1 | 1 |
| Reason not given | 2 | 0 |
