J. K. Cruickshank, N. M. Anderson, J. Wadsworth, S. M. Young, E. Jepson
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Treating hypertension in black compared with white non-insulin dependent diabetics: a double blind trial of verapamil and metoprolol.
British Medical Journal 1988; 297 :1155
doi:10.1136/bmj.297.6657.1155