| Intervention group(n = 74) | Control group(n = 58) | |
| Women | 64% | 73% |
| Age in years (median and range) | 50 (36–65) | 52 (34–66) |
| General practitioners | 68% | 68% |
| General internists | 18% | 21% |
| Specialists | 13% | 11% |
| Practising as practitioners in years (median and range) | 10 (1–14) | 10 (0–40) |
| Group practice | 51% | 31% |