Received: 1 June 2017
Accepted: 21 March 2018
First Online: 27 March 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Review Committee of the Shanghai Pulmonary Hospital(No.K16–223-1) and informed consent was obtained from all individual participants included in the study.
: Not applicable.
: No potential conflicts of interest were disclosed.
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