1 Department of Neurology, Otto von Guericke University, D-39120, Magdeburg, Germany; Institute of Advanced Studies, Tatarstan Academy of Sciences, Kazan, 422111, Russian Federation.
2 Department of Neurology, Otto von Guericke University, D-39120, Magdeburg, Germany.
3 Pain Center Clinic of Anaesthesiology and Intensive Care Medicine Medical Faculty Mannheim, Heidelberg University, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany.
4 Department of Surgery, Drexel University College of Medicine, Philadelphia, PA, 19102, USA. Electronic address: [email protected].