Funding for this research was provided by:
Mashhad University of Medical Sciences (910788)
Received: 15 December 2018
Accepted: 29 August 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: The entire procedure was approved by the Ethics Committee of Mashhad University of Medical Sciences and carried out with written informed consent of the donors.
: Not applicable.
: The authors declare that they have no competing interests.