Received: 1 January 2021
Accepted: 21 April 2021
First Online: 6 May 2021
: The performed study’s protocol was following the principles of the declaration of Helsinki and the Nuremberg Code. This study approved by the Ethics Committee of Tehran University of Medical Sciences and the project approval number is IR.TUMS.MEDICINE.REC.1396.4584.After presenting the study aims and enough explanations about the research program, and receiving a written informed consent form the parents, children who also had verbal agreement were included in the study.
: Not applicable.
: The authors declare that they have no conflict of interests. This research did not receive any external financial support.