Funding for this research was provided by:
Max Planck Institute for Demographic Research
Article History
Received: 31 December 2025
Accepted: 2 July 2026
First Online: 8 July 2026
Declarations
:
: The study was approved by the ethics committees of the First Affiliated Hospital of Xi’an Jiaotong University (Xi’an Jiaotong University was Chi Shen’s former affiliation before December 2024) with approval number [LLSBPJ-2024-WT-021]. Due to confidentiality restrictions, the full ethics approval details cannot be made publicly available. However, any qualified individual or institution may contact the Editorial Office to verify the ethics approval information with a reasonable request.
: Not applicable.
: The authors declare no competing interests.