Gu, Se Hun
Kumar, Mukesh
Sikorska, Beata
Hejduk, Janusz
Markowski, Janusz
Markowski, Marcin
Liberski, Paweł P.
Yanagihara, Richard
Article History
Received: 25 October 2015
Accepted: 18 January 2016
First Online: 19 February 2016
Competing interests
: The authors declare no competing financial interests.