This issue has been available online since 10th September 2020 for the regular issue of October 2020. All articles in this issue (6 original research articles) were authored/co-authored by 18 authors from 7 affiliations and 3 countries (Indonesia, Pakistan, and China).

This issue has been available online since 5th March 2020 for the regular issue of May 2020. All articles in this issue (6 original research articles) were authored/co-authored by 17 authors from 8 affiliations and 4 countries (Indonesia, United States, Australia, and China).

This issue has been available online since 25th November 2019 for the regular issue of October 2019. All articles in this issue (6 original research articles) were authored/co-authored by 13 authors from 7 affiliations and 2 countries (Indonesia and Vietnam).

This issue has been available online since 1st August 2019 for the regular issue of May 2019. All articles in this issue (6 original research articles) were authored/co-authored by 12 authors from 4 affiliations and 2 countries (Indonesia and Burundi).

This issue has been available online since 21st September 2018 for the regular issue of October 2018. All articles in this issue (6 original research articles) were authored/co-authored by 21 authors from 10 affiliations and 3 countries (Indonesia, Germany, and Japan).