161
Participants
Start Date
April 1, 2014
Primary Completion Date
December 1, 2017
Study Completion Date
March 30, 2018
N-acetylcysteine
600mg po twice a day for 12 months
On-demand treatment
receive as-needed therapy
Qilu Hospital of Shandong University, Jinan
Qilu Hospital of Shandong University
OTHER