Kern, Fredy
Dier, Tobias K. F.
Khatri, Yogan
Ewen, Kerstin M.
Jacquot, Jean-Pierre
Volmer, Dietrich A.
Bernhardt, Rita
Article History
Received: 30 May 2015
Accepted: 11 September 2015
First Online: 8 October 2015
Competing interests
: The authors declare no competing financial interests.