Article History
Received: 13 August 2019
Revised: 31 October 2019
Accepted: 17 December 2019
First Online: 10 January 2020
Compliance with ethical standards
: The study was a prospective comparative study before and after HD sessions. The research was approved by the IRB (institutional review board) of Mansoura University, faculty of medicine. Informed consent was obtained from a parent of each participant included in the study.
: The authors declare that they have no competing interests.