[1] Mol Neurophysiol Neuro & Sensory Physiol, Dusseldorf, Germany
[2] Univ Dusseldorf, Mol Neurophysiol, Inst Neuro & Sensory Physiol, Dusseldorf, Germany
[3] Inst Clin Neurosci & Med Psychol, Dusseldorf, Germany
[4] Univ Dusseldorf, Dept Gastroenterol Hepatol & Infect Dis, Dusseldorf, Germany