1. Department of AnatomyUniversity of CologneJoseph‐Stelzmann‐Strasse 9D‐50931CologneGermany
2. Department of NeurophysiologyUniversity of CologneJoseph‐Stelzmann‐Strasse 9D‐50931CologneGermany
3. Lilly Research Center LimitedWindlesham, SurreyGU20 6PHUK