Demirkan, K
Bayraktar-Ekincioglu, A
Gulhan-Halil, M
Abbasoglu, O
Article History
Received: 18 January 2016
Revised: 15 June 2016
Accepted: 11 July 2016
First Online: 10 August 2016
Competing interests
: The authors declare no conflict of interest.