100
Participants
Start Date
November 30, 2012
Primary Completion Date
April 30, 2014
Study Completion Date
September 30, 2014
Theophylline
Theophylline 0.1 bid
Placebo(for Theophylline)
Starch tablet manufactured to Theophylline 100mg (Theophylline Stained-Release Tablet)
State Key Laboratory of Respiratory Research Institute., Guangzhou
The First Affiliated Hospital of Guangzhou Medical University
OTHER