Fig. 1
Flowchart of participant selection in the National Health and Nutrition Examination Survey (NHANES) 1999–2020 and China Health and Retirement Longitudinal Study (CHARLS) 2011–2020.
Fig. 1 | Scientific Reports
Flowchart of participant selection in the National Health and Nutrition Examination Survey (NHANES) 1999–2020 and China Health and Retirement Longitudinal Study (CHARLS) 2011–2020.
