1. Division of Diabetes, Endocrinology and Metabolism, Imperial College London W12 0NN, United Kingdom
2. Institute of Metabolism and Systems Research, University of Birmingham, Edgbaston B15 2TT, United Kingdom
3. Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham B15 2TH, United Kingdom
4. Centre of Membrane Proteins and Receptors, University of Birmingham, Birmingham B15 2TT, and University of Nottingham, Nottingham NG7 2RD, United Kingdom