Received: 14 February 2020
Accepted: 21 September 2020
First Online: 8 October 2020
Ethics approval and consent to participate
: Ethics approval has been gained from The Institutional Review Board (IRB) of The First Affiliated Hospital of Sun Yat-sen University (ICE-2017-296), China and was reviewed and approved by the Brigham and Women’s Hospital Institutional Review Board. Qualified research staff has been trained on ethics and data protection issues before recruitment. An online written patient consent obtained.
: Not applicable.
: The authors declare that they have no competing interests.