1. Dermatology Centre; Institute of Inflammation and Repair; University of Manchester; Manchester Academic Health Science Centre; Salford Royal NHS Foundation Trust; Manchester U.K
2. School of Earth Atmospheric and Environmental Sciences; University of Manchester; Manchester U.K
3. Vitamin D Research Laboratory; Endocrine and Diabetes Research Group; Institute of Human Development; University of Manchester; Manchester Academic Health Science Centre; Manchester Royal Infirmary; Manchester U.K
4. Centre for Biostatistics; Institute of Population Health; University of Manchester; Manchester Academic Health Science Centre; Salford Royal NHS Foundation Trust; Manchester U.K