Received: 19 November 2018
Accepted: 4 July 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: This study was approved by the research ethics committee office in the College of Science, University of Salahaddin-Erbil (No. 2414/54/7 (B)).
: Not applicable.
: The authors declare that they have no competing interests.