Received: 8 July 2019
Accepted: 17 February 2020
First Online: 20 April 2020
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of the Faculty of Medicine, Fayoum University. Participants’ guardians were informed about the objectives of the study and the required examination and investigations, and written consent was obtained from them. Confidentiality of the participants’ data was maintained, and their right not to participate in the study was ensured (ethics committee’s reference number: 23-13/03/2016).
: Not applicable
: The authors declare that they have no competing interests.