Table 3. List of articles sort according to countries.

Country	Authors		Total
Algeria	Troudi and Bouyoucef (2020)		1
Australia	Nimri et al. (2020)		1
Bangladesh	Zahan et al. (2020)		1
Cambodia	Liao et al. (2020)		1
China	Ahmad and Zhang (2020)	Wang et al. (2019)	10
	Ali et al. (2019)	Yang et al. (2019)
	He et al. (2021)	Yang et al. (2020)
	Sheng et al. (2019)	Zhang et al. (2018)
	Wang et al. (2020)	Zhang et al. (2019)
Germany	Eberhart and Naderer (2017)		1
Ghana	Amoako et al. (2020)		1
India	Jaiswal and Kant (2018)	Troudi and Bouyoucef (2020)	8
	Joshi and Rahman (2019)	Joshi and Rahman (2017)
	Kumar et al. (2017)	Sharma et al. (2020)
	Trivedi et al. (2018)	Uddin and Khan (2018)
Indonesia	Sari et al. (2020)		1
Iran	Siyavooshi et al. (2019)		1
Italy	Laureti and Benedetti (2018)		1
Spain	Morales-Contreras et al. (2019)	Varela-Candamio et al. (2018)	2
Jordan	Al-Adamat et al. (2020)		1
Malaysia	Ahamat et al. (2018)	Mohd Suki and Mohd Suki (2019)	3
	Al Mamun et al. (2020)
Mexico	Leal et al. (2020)	Müller et al. (2021)	2
Poland	Caniëls et al. (2021)		1
South Korea	Ahn et al. (2020)	Park and Sohn (2018)	2
USA	Choi and Johnson (2019)	Onel (2017)	2
USA and South Korea	Van Tonder et al. (2020)		1
Vietnam	Giao (2020)
Total			41