Genomic Medicine Research Group, School of Biomedical Sciences, Ulster University, Coleraine BT52 1SA, UK. Nutrition Innovation Centre for Food and Health, School of Biomedical Sciences, Ulster University, Coleraine, UK. MRC Integrative Epidemiology Unit, Bristol Medical School, University of Bristol, Bristol, UK. Psychology Institute, Ulster University, Coleraine, UK. Genomic Medicine Research Group, School of Biomedical Sciences, Ulster University, Coleraine BT52 1SA, UK. cp.walsh@ulster.ac.uk.