1.2.3 Quality Control of Questionnaire Survey
The respondent using the same IP address can only answer the survey
once. The respondents should be aged between 18 and 60 years, and their
answers should not have logical errors. According to the completion time
of the pre-survey collected, the questionnaire with the completion time
of the whole piece less than 3 minutes would be screened out, so as to
ensure the quality of it.