1. London Regenerative Medicine Network, London, United Kingdom.
2. Centre for Cutaneous Research, Blizard Institute of Cell and Molecular Science, London, United Kingdom.
3. Clinical Trials Unit, University College London, United Kingdom.
4. Centre for Cell, Gene & Tissue Therapeutics, Royal Free Hospital, London, United Kingdom.
5. Ear Institute, University College London, Royal National Throat Nose and Ear Hospital, London, United Kingdom.
6. Great Ormond Street Hospital, Cardiothoracic Surgery, and Tracheal Services, London, United Kingdom.
7. Advanced Centre for Biochemical Engineering, University College London, London, United Kingdom.