Demographics of included patients (N = 33).
| Demographic | Mean (SD) or n (%) |
| Age, y, mean (SD) | 58.8 (8.7) |
| Body mass index, mean (SD) | 31.3 (7.2) |
| Women, n (%) | 20 (60.6%) |
| Current smoker, n (%) | 7 (25.9%) |
| Diabetes mellitus, n (%) | 8 (29.6%) |
| Number of levels, n (%) | |
| 3 | 22 (66.7%) |
| 4 | 10 (30.3%) |
| 5 | 1 (3.0%) |