Conducting expert consultation
On August 2020, the research group launched the first round of Delphi consultation to the selected experts. The consultation questionnaire was sent via E-mail to the experts. After the first round of questionnaires were collected, the index items were analyzed with reference to expert opinions. The index items were analyzed according to the criteria that the coefficient of variation should be less than 0.25 and the mean should be greater than 3.5 [