A Study to Evaluate the Sensitivity and Specificity of Inhaled Methacholine in Bronchial Provocation Test

The Affiliated Hospital of Inner Mongolia Medical Univercity, Hohhot

Beijing Chaoyang Hospital, Capital Medical University, Beijing

Benxi Central Hospital, Benxi

Weifang NO.2 People's Hospital, Weifang

Zhejiang Provincial Hospital of Chinese Medicine, Hangzhou

The First Affiliated Hospital of Nanchang University, Nanchang

Tongji Hospital affiliated to Tongji Medical College of Huazhong University of Science and Technology, Wuhan

The First Affiliated Hospital of Guangzhou Medical University, Guangzhou

Guangdong Province Hospital of chinese medicine, Guangzhou

Liuzhou people's Hospital, Liuzhou

West China Hospital，Sichuan University, Chengdu

The First Hospital of Lanzhou University, Lanzhou