External validity of randomized controlled trials of glycaemic control and vascular disease: how representative are participants?

C. Saunders, C. D. Byrne, B. Guthrie, R. S. Lindsay, J. A. McKnight, S. Philip, N. Sattar, J. J. Walker and S. H. Wild

Diabetic Medicine 30 ( 3 ): 300 - 308 , 2013