Funding for this research was provided by:
the Swedish Heart–Lung Foundation (2017-0626, 2016-0315)
the Region Skåne County Council
the China Scholarship Council (201808320331)
Text and Data Mining valid from 2019-11-18
Received: 10 July 2019
Accepted: 25 October 2019
First Online: 18 November 2019
Ethics approval and consent to participate
: The study has been approved by the Regional Ethical Review Board in Lund, Sweden (LU 51/90) and was carried out in accordance with the Helsinki Declaration. Written informed consent have been obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.