https://www.jiem.org/files/journals/1/articles/5968/submission/original/5968-16263-1-SM.html

https://www.jiem.org/files/journals/1/articles/5969/submission/original/5969-16264-1-SM.html

https://www.jiem.org/files/journals/1/articles/5971/submission/original/5971-16266-1-SM.html