Krawczyk, Marcin
Milkiewicz, Malgorzata
Marschall, Hanns-Ulrich
Bartz, Clemens
Grünhage, Frank
Wunsch, Ewa
Milkiewicz, Piotr
Lammert, Frank
Article History
Received: 17 March 2014
Accepted: 18 August 2014
First Online: 9 October 2014
Competing interests
: The authors declare no competing financial interests.