Kirmse, Knut
Kummer, Michael
Kovalchuk, Yury
Witte, Otto W.
Garaschuk, Olga
Holthoff, Knut
Article History
Received: 6 February 2015
Accepted: 8 June 2015
First Online: 16 July 2015
Competing interests
: The authors declare no competing financial interests.