1 Department of Plastic & Reconstructive Surgery, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY, UK. Electronic address: a.m.rose@dundee.ac.uk.
2 Department of Plastic & Reconstructive Surgery, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY, UK.
3 Department of Pathology, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK.
4 Department of Dermatology and Division of Cancer Research, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY, UK.