(a).
| Healthy controls | |||
|---|---|---|---|
| Age | Sex | Smoking status | Pack years |
| 66 | Male | Nonsmoker | 0 |
| 66 | Male | Nonsmoker | 0 |
| 62 | Female | Ex-smoker | 15 |
| 70 | Male | Nonsmoker | 0 |
| 63 | Female | Nonsmoker | 0 |
| 67 | Male | Nonsmoker | 0 |
| 61 | Female | Nonsmoker | 0 |
| 67 | Male | Nonsmoker | 0 |
| 20 | Male | Nonsmoker | 0 |
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