**Ethics approval and consent to participate**

This is the grant number for ethics approval (20/Panke.KKE/I/2017). A written informed consent was obtained from every parent to be included in the study. This study was approved by Institutional Review Boards of Dr. Soetomo General Hospital Ethics Committee for Health Research at Surabaya, January 20, 2017. Informed consent was validated by the Institutional Review Boards of Dr. Soetomo General Hospital Ethics Committee for Health Research. All parents provided written informed consent to participate and were free to decline.
