Department of Bioengineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.|Department of Clinical and Experimental Medicine, Linkxc3xb6ping University, SE-581 85 Linkxc3xb6ping, Sweden.|Department of Clinical and Experimental Medicine, Linkxc3xb6ping University, SE-581 85 Linkxc3xb6ping, Sweden.|The Rolf Luft Research Center for Diabetes and Endocrinology, Karolinska Institutet, SE-171 77 Stockholm, Sweden.|Department of Clinical and Experimental Medicine, Linkxc3xb6ping University, SE-581 85 Linkxc3xb6ping, Sweden.|Department of Bioengineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.