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Subject characteristics.
| Patients | Normal controls | |
| (male/female) | (male/female) | |
| Smoker | 1/0 | 0/0 |
| Ex-smoker | 0/0 | 2/0 |
| Nonsmoker | 9/5 | 6/8 |
| Asthma | 1/0 | 0/0 |
| NSAID | 2/0 | 0/0 |
| Steroids | 2/1 | 0/0 |
| Foot ulcers | 6 | 0 |
| Osteoradionecrosis | 7 | 0 |
| Dental caries | 1 | 0 |
| Radiation cystitis | 1 | 0 |
| Lumbar cord oedema | 1 | 0 |
| Total | 10/5 | 8/8 |
