Coefficient and authority of experts
| Delphi survey |  Positive coefficient of expert | Degree of expert authority | ||||
| Distribute questionnaire | Recovery questionnaire | Recovery rate (%) | Judgement coefficient (Ca) | Familiarity coefficient (Cs) | Authority coefficient (Cr) | |
| Round 1 | 37 | 36 | 97 | 0.98 | 0.91 | 0.95 |
| Round 2 | 36 | 36 | 100 | 0.98 | 0.93 | 0.96 |