Funding for this research was provided by:
Faculty of Medicine of Airlangga University, Surabaya, Indonesia. (No. 133/UN3.1.1/KD/2017)
Received: 13 June 2018
Accepted: 22 May 2019
First Online: 8 June 2019
Ethics approval and consent to participate
: We sought an approval of whole project from Dr. Soetomo General Hospital as our Institutional Review Board. Ethical Clearance by Ethical Committee in Health Research Dr. Soetomo General Hospital Surabaya Number 390/Panke.KKE/V/2017. The need to ask Ethical approval and the need to ask consent from parents was waived by our Ethical Committee because no human subjects were involved in this study.
: Not applicable.
: The authors declare that they have no competing interests.