From the State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China. Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, NC, USA. Surrey Clinical Trials Unit and Clinical Research Facility, Department of Clinical and Experimental Medicine, University of Surrey, Guildford, United Kingdom. Royal Sussex County Hospital, Brighton, United Kingdom. and Faculty of Health and Medical Sciences, Department of Nutritional Sciences, University of Surrey, Guildford, United Kingdom.