1. Integrated Pathology Unit, Centre for Molecular Pathology, The Royal Marsden Trust and Institute of Cancer Research, Sutton SM2 5NG, UK
2. Leibniz Institute for Photonic Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany
3. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University, Helmholtzweg 4, 07743 Jena, Germany
4. Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK