Positive bronchial provocation test and lower small airway function in the cough variant asthma 
WU Yufen, ZHANG Hao, GUO Yanfang, ZHANG Xin, ZHU Xiaohong, PAN Hanyun
临床儿科杂志 . 2015, (4): 330 .  DOI: 10.3969 j.issn.1000-3606.2015.04.009