19,491
Participants
Start Date
March 13, 2020
Primary Completion Date
March 13, 2020
Study Completion Date
April 3, 2020
Questionnaire with precaution information
Ever blood donors in this group would receive a questionnaire which includes some information about how donors can donate safely and how blood center will protect the blood donors during the epidemic of COVID-19.
Experimental: Questionnaire without precaution information
Ever blood donors in this group would receive a questionnaire which dose not include the information above.
Guangzhou Blood Center, Guangzhou
Guangzhou Blood Center
OTHER_GOV