Authors’ contributions
Chao Wu, Jing Wu and Yinjuan Zhang contributed to the research design and paper writing; Linyuan Zhang Hongjuan Lang and Sheng Zhao contributed to the distribution and collection of the Delphi expert consultation questionnaire as well as data analysis; Lu Li, Nana Chen and Hongjuan Lang contributed to the implementation; Liping Zhu, Juan Du and Jing Wu contributed to the proofreading and English version of the paper. All authors reviewed the manuscript.