Figures & data
Data availability statement
The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials. The data obtained by interviews from sources has been approved for distribution, because before conducting interviews the author has first shown a letter of permission to conduct interviews and collect data from the Universitas Sumatera Utara as an institution that funds this research. The research permit letter shown to the interviewee is in the appendix of the document in the form of a scanned document. The data that support the findings of this study are available from the corresponding author, Marlina, upon reasonable request. Research data can be obtained on the Google Drive link with the URL: https://drive.google.com/drive/folders/1sL-nmsQI_mkjqCBUfbl-SSLN7_vAvy_C?usp=sharing