Table 1. Hospitals participating in this study, and the number and percentage of patients from each hospital.
| Participating hospital | No. of patients | % | |
| 1 | Osaka University Hospital | 73 | 50.7 |
| 2 | Osaka Rosai Hospital | 18 | 12.5 |
| 3 | Kansai Rosai Hospital | 17 | 11.8 |
| 4 | Osaka National Hospital, National Hospital Organization |
9 | 6.3 |
| 5 | Sakai City Hospital | 8 | 5.6 |
| 6 | Toyonaka City Hospital | 7 | 4.9 |
| 7 | Sumitomo Hospital | 5 | 3.5 |
| 8 | Osaka Police Hospital | 3 | 2.1 |
| 9 | Itami Municipal Hospital | 2 | 1.4 |
| 10 | Minoh City Hospital | 2 | 1.4 |
| Total | 144 | 100 |