Received: 16 April 2019
Accepted: 9 October 2019
First Online: 15 November 2019
Ethics approval and consent to participate
: This study was approved by ethical research committee of the Faculty of Biological Science of the University of Chittagong, Bangladesh (AERB/FBS/UC/02, 2015).
: Not applicable.
: The authors declare that they have no competing interests.