Tranca, D. E.
Stanciu, S. G.
Hristu, R.
Stoichita, C.
Tofail, S. A. M.
Stanciu, G. A.
Article History
Received: 10 March 2015
Accepted: 28 May 2015
First Online: 3 July 2015
Competing interests
: The authors declare no competing financial interests.