Trends in diabetes medication use in Australia, Canada, England, and Scotland: a repeated cross-sectional analysis in primary care by Greiver, M, Havard, A, Bowles, JK, Kalia, S, Chen, T, Aliarzadeh, B, Moineddin, R, Sherlock, J, Hinton, W, de Lusignan, S, Sullivan, F, O'Neill, B, Pow, C, Bhatt, A, Rahman, F, Meza-Torres, B, Litchfield, M