CJCP     2019 21 (5):  426-430    ISSN: 1008-8830  CN: 43-1301/R Correlation of fractional exhaled nitric oxide in the upper and lower airways with the level of asthma control MU Dong-Qin, PAN Jia-Hua Department of Pediatrics, Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, China Received: 2018-10-23  Revised: null  Online: null Supporting info null