Funding for this research was provided by:
Universiti Malaya (RG422/12HTM)
Ministry of Higher Education, Malaysia (UM.C/625/1/HIR/MoE/DENT /24)
Received: 7 April 2017
Accepted: 24 January 2018
First Online: 5 February 2018
: The toxicity tests were carried out according to Organization for Economic Cooperation and Development (OECD) test guideline, i.e., OECD Guideline 423 for acute oral toxicity test and OECD Guideline 407 for the sub-acute oral toxicity test, with slight modifications. Protocols of this study (Acute and Sub-acute oral toxicity tests) approved by the Institutional Animal Care and Use Committee (IACUC), Faculty of Medicine, University of Malaya, Malaysia (Ethics No. 2014-02-14/OBBS/R/NAA).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.