72
Participants
Start Date
July 11, 2017
Primary Completion Date
December 30, 2017
Study Completion Date
August 20, 2018
phone call
Investigators give a regular follow-up to participants: phone call monthly
wechat group
Investigators give a regular follow-up to participants: wechat follow up. Investigators send useful information and answer their questions monthly.
Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou
Sun Yat-sen University
OTHER