Ethical considerations
The study was approved by the institutional review board of the hospital (code number: 4-2018-0706). The researcher explained the purpose and process of the study to potential participants and written informed consent was obtained from all parents who agreed to participate. The parents were informed that they could withdraw from the study at any time with no loss of benefits, and the researcher explained that the collected data would be used for research purposes only. To ensure each participant’s anonymity and confidentiality, the collected personal information was coded and stored in an electronic file with a password, and the documented data were stored in a locked bookshelf.