1. Eduard-Zintl Institute for Inorganic and Physical Chemistry, TU Darmstadt, Darmstadt 64287, Germany
2. International Tomography Center, Institutskaya 3A, Novosibirsk and Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia
3. Medical Faculty, Institute for Biometrics and Medical Informatics, Otto-von-Guericke University Magdeburg, 39120 Magdeburg, Germany
4. Freie Universität Berlin, Institut für Chemie und Biochemie, Takustr. 3, D-14195 Berlin, Germany