1. Department of Physics, Modern Optics and Quantum Electronics and Center for Applied Photonics, University of Konstanz, Konstanz, 78457, Germany
2. Department of Biology, Bioimaging Center and Center for Applied Photonics, University of Konstanz, Konstanz, 78457, Germany
3. Present Address: Light Microscopy Centre, ETH Zürich, Zürich, 8093, Switzerland