Canagliflozin, dapagliflozin and empagliflozin monotherapy for treating type 2 diabetes: systematic review and economic evaluation. by Johnston, R, Uthman, O, Cummins, E, Clar, C, Royle, P, Colquitt, J, Tan, B, Clegg, A, Shantikumar, S, Court, R, O'Hare, J, McGrane, D, Holt, T, Waugh, N