arash arya department of electrophysiology, heart centre university of leipzig, leipzig, germany; department for electrophysiology, heart centre university of leipzig, strümpellstr. 39, 04289 leipzig, germany, tel: +49-3418651410, fax: +49-3418651460 simon kircher department of electrophysiology, heart centre university of leipzig, leipzig, germany andreas müssigbrodt department of electrophysiology, heart centre university of leipzig, leipzig, germany charlotte eitel department of electrophysiology, heart centre university of leipzig, leipzig, germany philipp sommer department of electrophysiology, heart centre university of leipzig, leipzig, germany gerhard hindricks department of electrophysiology, heart centre university of leipzig, leipzig, germany