- Correspondence to Xinhua Yu, Priority Area Asthma and Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research (DZL), Borstel 23845, Germany;
- Received September 26, 2018
- Revised November 19, 2018
- Accepted November 20, 2018
- First published January 13, 2019.
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