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Contributors JY: data collection, data analysis, data synthesis and authorship of article. WY: data collection, data analysis, study conception and authorship of article. EK and ST: data collection, data analysis and data synthesis. MM: study conception, data analysis and authorship of article. SO: the guarantor and study conception, data analysis, data synthesis and authorship of article. All authors reviewed the results and approved the final version of the manuscript.
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 Dr SO is on the editorial board of RAPM. The other authors declare no conflicts of interest.
Provenance and peer review Not commissioned; externally peer reviewed.