M Güran, G Şanlıtürk, DK Demirdöv, PI Neophytou and C Gürkan have contributed to the writing or review of the manuscript, study conception and design. Material preparation, data collection and analysis were performed by G Şanlıtürk, DK Demirdöv, M Al-sharakhi, Y Hikal, M Haidar, KS Kunt and H Selevany. The first draft of the manuscript was written by M Güran. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.