Demographic characteristics of the study groups
| Patients (n=39) | Relatives (n=34) | Spouses (n=22) | Controls (n=29) | |
| Age (median (range)) | 44 (20–63) | 46 (18–70) | 47 (25–61) | 38 (22–60) |
| Sex (M/F) | 18/21 | 16/18 | 11/11 | 12/17 |
| Smokers/non-smokers | 19/20 | 8/26 | 4/18 | 2/27 |