Funding for this research was provided by:
Health management and economics research center, Iran University of Medical Sciences (95-02-163-28619)
Text and Data Mining valid from 2019-01-18
Received: 9 September 2018
Accepted: 29 December 2018
First Online: 18 January 2019
Conflicts of interest
: On behalf of all authors, the corresponding author states that there is no conflict of interest.