Minimal improvement in coronary artery disease risk prediction in Chinese population using polygenic risk scores: evidence from the China Kadoorie Biobank by Yang, S, Sun, D, Sun, Z, Yu, C, Guo, Y, Si, J, Sun, D, Pang, Y, Pei, P, Yang, L, Millwood, IY, G Walters, R, Chen, Y, Du, H, Pang, Z, Schmidt, D, Stevens, R, Clarke, R, Chen, J, Chen, Z, Lv, J, Li, L