Received: 7 May 2020
Accepted: 21 July 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: Ethics approval for the study was obtained by the Faculty of Medicine, University of Colombo, Ethics Review Committee and written informed consent for genetic testing was obtained from the parents the children as they were minors.
: Written consent for publication was obtained from the parents.
: Authors declare that there are no competing interests.