Received: 27 May 2019
Accepted: 5 June 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: The study was approved by the ethics review committee of King Abdulaziz University Hospital, reference number (179-18), its Chairman Prof. Hassan Alzahrani. The study was conducted according to the ethical guidelines conforming to the declaration of Helsinki, and patients’ parents/guardians consented to participate; therefore, a written consent was obtained.
: Not applicable
: The authors declare that they have no competing interests.