1 Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London W12 0NN, UK; Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, UK.
2 Department of Endocrinology, Division of Medicine, Faculty of Medical Sciences, Royal Free Campus, University College London, London, UK.
3 Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, UK.
4 Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London W12 0NN, UK.
5 Florence Nightingale Faculty of Nursing, Midwifery and Palliative Care, King's College London, London, UK.
6 Division of Diabetes, Endocrinology and Metabolism, Department of Metabolism, Digestion and Reproduction, Imperial College London, London W12 0NN, UK; Department of Endocrinology, Imperial College Healthcare National Health Service Trust, London, UK. Electronic address: w.dhillo@imperial.ac.uk.