Funding for this research was provided by:
GlaxoSmithKline (China) R&D Company Limited
Received: 29 May 2019
Accepted: 16 June 2020
First Online: 17 July 2020
Ethics approval and consent to participate
: The study protocol was approved by independent ethics committee or institutional review board at each centre. All patients provided written informed consent before any study-specific procedure was performed.
: Not applicable.
: Jinhua Zhong, Wenjing Zhu and Pingping Wang were employees of GSK during the conduct of this study and manuscript development. All other authors have nothing to disclose.