* Drs. Zhu-Quan Su, Zi-Qing Zhou, and Wei-Jie Guan are co-first
authors.
Acknowledgments: We thank Prof. Zheng Jing-ping, Prof. Gao Yi,
Prof. Xie Yan-qing, Dr. An Jia-ying, Dr. Wu Zhong-ping, Dr. Yu Xin-xin
and Dr. Liu Wen-ting. (State Key Laboratory of Respiratory Disease,
National Clinical Research center for Respiratory Disease, Guangzhou
Institute of Respiratory Health, First Affiliated Hospital of Guangzhou
Medical University, Guangzhou Medical University) for their technical
assistance in the pulmonary function test.