1 School of Medical Sciences, Faculty of Medical and Human Sciences, The University of Manchester, Stopford Building, Oxford Road, Manchester, M13 9PT, UK. Mohammad.alzaid@student.manchester.ac.uk.
2 Mid Cheshire NHS Foundation Trust, Macclesfield, UK.
3 Dermatological Surgery and Laser Unit, St John's Institute of Dermatology, Guy's Hospital Cancer Centre, Guy's and St Thomas' NHS Foundation Trust, Great Maze Pond, London, UK.
4 Department of Otolaryngology, Manchester Royal Infirmary, Manchester, UK.