1,188
Participants
Start Date
November 30, 2015
Primary Completion Date
March 31, 2016
Study Completion Date
June 30, 2016
Text message
Text messages would be sent via the messaging platform of Guangzhou Blood Center. The feedback of sending status (received, failed to receive, or unknown) would be marked on every number. Four to six months follow-up, blood donation rate would be checked.
Telephone
Status (response, no answer, line issue, wrong number or refused to be interviewed) of every donor in this groups would be marked. Four to six months follow-up, blood donation rate would be checked.
Guangzhou Blood Center, Guangzhou
Guangzhou Blood Center
OTHER_GOV