pone.0229176.g002.tif (697.58 kB)
Flow chart of the sampling and matching process.
figure
posted on 2020-02-20, 18:26 authored by Ya-Ting Huang, Ying-Wei Wang, Chou-Wen Chi, Wen-Yu Hu, Rung Lin Jr, Chih-Chung Shiao, Woung-Ru TangCCI = Charlson Comorbidity Index.