1. Department of Nuclear Medicine; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraße 1 55131 Mainz Germany
2. Institute of Microscopic Anatomy and Neurobiology; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraße 1 55131 Mainz Germany
3. Institute of Medical Biostatistics, Epidemiology and Informatics; University Medical Center of the Johannes Gutenberg University Mainz; Obere Zahlbacher Straße 69 55131 Mainz Germany
4. Institute of Physiological Chemistry; University Medical Center of the Johannes Gutenberg University Mainz; Duesbergweg 6 55128 Mainz Germany