Activities of daily living limitations and the use of physical examination among older adults with informal care in China: do gender and residence make differences?

"Declarations Ethics approval and consent to participateThis study protoco was approved and organized by Health Commission of Shandong Province. This study was reviewed and approved by the Institutional Review Board (Academic Research Ethics Committee) of Shandong University School of Public Health. All procedures were in accordance with the ethical standards of the Helsinki Declaration. Informed consent has been obtained from the participants, their parents and legally authorized representatives in this study. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This work was supported by the National Natural Science Foundation of China (grant numbers 72274109, 71974117, 71774104). The funders had no role in study design, data collection, analysis, decision to publish, or manuscript preparation."