22
Participants
Start Date
July 31, 2015
Primary Completion Date
July 31, 2016
Study Completion Date
December 31, 2016
methacholine
methacholine (0.03,0.06,0.125,0.5,1.0,2.0,4.0,8.0,16.0 mg/ml),Canada
Wright Nebulizer
nebulized for 2 minutes with an output of 0.13ml/min
Devilbiss646 Nebulizer
nebulized for 2 minutes with an output of 0.13ml/min
Guangzhou institute of respiratory disease, Guangzhou
Firestone Institute for Respiratory Health
OTHER
Guangzhou Institute of Respiratory Disease
OTHER