“…The first stage of synthesizing the 152 literatures is dividing them according to 2 classifications, literatures from the developed countries and literatures from developing countries as presented in Table 2 & 3. (Afzal et al, 2019;Anish et al, 2019;Bhangale, 2016;Chandramohan et al, 2012;Cindrela Devi & Ananthanarayanan, 2017;Ghumare et al, 2019;Kant, 2018;Muthu Venkata Sekar & Mahalakshmi, 2018;Pai et al, 2018;Raju et al, 2017;Shaktawat & Vadhera, 2017;Shanmuganathan & Baskar, 2015;Sharma et al, 2020;Sharma & Goyal, 2019;Shrivastava et al, 2019;Subramani & Sivakumar, 2018;Velumani & Nampoothiri, 2019;Venkateswaran & Murugasan, 2017;Wanjari & Dobariya, 2016) Malaysia 20 (Abdullah et al, 2018;Afzal et al, 2019;Akram et al, 2017;Asmi et al, 2013;Azis et al, 2013;Hameed Memon et al, 2014;Haslinda et al, 2018;Ismail et al, 2013;Karunakaran et al, 2018;Liew et al, 2019;Memon et al, 2011Memon et al, , 2012Rahman et al, 2013;C. Ramanathan et al, 2012;C.…”