The power of genetic diversity in genome-wide association studies of lipids by Graham, SE, Clarke, SL, Wu, K-HH, Lin, K, Millwood, IY, Mahajan, A, Goel, A, Liu, J, Rayner, NW, McCarthy, MI, van Duijn, CM, Rayner, NW, Karpe, F, Neville, MJ, Walters, RG, Holmes, MV