1. Department of Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
2. NanoLund, Lund University, P.O. Box 118, SE-221 00, Lund, Sweden
3. Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark