1Department of Physiology, Christian-Albrechts-Universität zu Kiel, Kiel, Germany 2Division of Neurological Pain Research and Therapy, Department of Neurology, Christian-Albrechts-Universität zu Kiel, Kiel, Germany *Corresponding author. Tel.: +431 8802036; fax: +431 8805256. E-mail address:[email protected]
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Jänig et al. (2006) studied this question.
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