Funding for this research was provided by:
Medizinische Universität Wien
Text and Data Mining valid from 2019-02-01
Received: 7 November 2018
Accepted: 5 January 2019
First Online: 1 February 2019
Conflict of interest
: A.K. Shrestha, Z. Özlü-Erkilic, C. Popow, S. Ohmann, and T. Akkaya-Kalayci declare that they have no competing interests.