Text and Data Mining valid from 2019-02-09
Received: 19 September 2018
Accepted: 24 January 2019
First Online: 9 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by Noninvasive Research Ethics Board of Dokuz Eylül University School of Medicine (protocol no: 3180-GOA, decision number: 2017/05-11) and was pre-registered in PROSPERO (CRD42017058527), in March 2017.
: All data are available in the submitted manuscript or as appendix.