1. School of Chemical Sciences, Universiti Sains Malaysia (USM), Penang, Malaysia
2. Department of Pure and Industrial Chemistry, Umaru Musa Yar’adua University, Katsina, Nigeria
3. Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Penang, Malaysia
4. Department of Chemistry Education, Universitas Pendidikan Indonesia, Bandung, Indonesia
5. Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan