Zghebi, S. S., Panagioti, M., Rutter, M. K., Ashcroft, D. M., van Marwijk, H., Salisbury, C., Chew-Graham, C. A., Buchan, I., Qureshi, N., Peek, N., Mallen, C., Mamas, M., Kontopantelis, E., "Assessing the severity of Type 2 diabetes using clinical data-based measures: a systematic review", Diabetic Medicine, 2019