Living near a Major Road in Beijing: Association with Lower Lung Function, Airway Acidification, and Chronic Cough oleh Zhan-Wei Hu, Yan-Ni Zhao, Yuan Cheng, Cui-Yan Guo, Xi Wang, Nan Li, Jun-Qing Liu, Hui Kang, Guo-Guang Xia, Ping Hu, Ping-Ji Zhang, Jing Ma, Ying Liu, Cheng Zhang, Li Su, Guang-Fa Wang