Reasons for loss to follow-up
| Subjects n | 127 |
| High suspicion of secretion | 104 (81.9) |
| Patient did not return | 13 (10.2) |
| Study too recent for follow-up | 5 (3.9) |
| Referral to other hospital | 4 (3.1) |
| Unclear | 1 (0.8) |
Data are presented as n (%), unless otherwise stated.