Association between atmospheric concentration of particulate matters and inpatient and outpatient visits for chronic respiratory diseases in Xiamen, China oleh Tao-Ling Zhong, Yi-Wei Zhang, Xiang-Yang Yao, Guang-Hui Xu, Hui Liu, Qiu-Shi Xu, Wei Sun, Zhi-Bin Li, Yun-Gang Yang, Jin-Zhun Wu, Chao Zheng, Qi-Yuan Li, Lin-Fu Zhou, Pei-Fang Wei