1. Goodrest Croft Surgery; Yardley Wood
2. Division of Endocrinology and Metabolic Medicine; Department of Medicine; Faculty of Medicine; St Mary's Hospital; Imperial College London; London; UK
3. Department of Biochemistry; Good Hope Hospital; Heart of England Foundation NHS trust; Sutton Coldfield; UK
4. Main Outpatients; Portland Hospital; UK
5. National Heart & Lung Institute; Imperial College London; Royal Brompton Hospital; London; UK