1. Department of Psychiatry and Psychotherapy; Friedrich-Alexander-University of Erlangen-Nuremberg; Erlangen 91054 Germany
2. Nano-Optics Division, Max Planck Institute for the Science of Light; Erlangen 91058 Germany
3. Institute of Medical Biotechnology; Friedrich-Alexander-University of Erlangen-Nuremberg; Erlangen 91052 Germany
4. Department of Biochemistry and Molecular Medicine; Friedrich-Alexander-University of Erlangen-Nuremberg; Erlangen 91054 Germany