Silalahi, Florence Elfriede Sinthauli http://orcid.org/0000-0001-9817-2190
Pamela, http://orcid.org/0000-0002-9598-2187
Arifianti, Yukni http://orcid.org/0000-0003-3838-2529
Hidayat, Fahrul http://orcid.org/0000-0002-8634-0641
Funding for this research was provided by:
Ministry of Higher Education and Technology of Republic of Indonesia (264/RISET-Pro/FGS/VIII/2017)
Article History
Received: 14 June 2019
Accepted: 9 October 2019
First Online: 1 November 2019
Competing interests
: The authors declare that they have no competing interests.