1. Molecular and Clinical Sciences Research Institute (Dermatology Unit), St George's, University of London, London, United Kingdom.
2. Department of Medical Physics and Clinical Engineering, St George's University Hospitals NHS Foundation Trust, London, United Kingdom.
3. Department of Radiology, St George's University Hospitals NHS Foundation Trust, London, United Kingdom.
4. Department of Dermatology, St George's University Hospitals NHS Foundation Trust, London, United Kingdom.