Langer, L.
Poltavtsev, S. V.
Yugova, I. A.
Salewski, M.
Yakovlev, D. R.
Karczewski, G.
Wojtowicz, T.
Akimov, I. A.
Bayer, M.
Article History
Received: 19 January 2014
Accepted: 20 August 2014
First Online: 28 September 2014
Competing interests
: The authors declare no competing financial interests.