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TP and YW are joint first authors.
Twitter @Thanya_Indu, @FrederikMartiny
Contributors TP and YW conceived the idea and wrote the first draft. TC, FM, RM, KM, JT reviewed and approved for submission. TIP and YW are responsible for the overall content as guarantors.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests YW's spouse works for BMJ China. JT is the clinical research editor of the BMJ.
Provenance and peer review Not commissioned; externally peer reviewed.