Table 6.

Top 20 coauthorships by country using VOSviewer.

Country rank	Country	Number of documents	Total citations, n	TLSa
1	United States	311	5388	141
2	United Kingdom	94	2350	99
3	Canada	66	2021	64
4	China	61	987	54
5	Australia	54	1505	44
6	India	70	788	40
7	Pakistan	24	713	34
8	Hong Kong	21	463	32
9	Italy	42	1011	32
10	South Africa	26	86	32
11	Germany	30	278	31
12	Spain	50	1012	30
13	Singapore	18	232	28
14	South Korea	18	128	28
15	Switzerland	17	406	28
16	Saudi Arabia	35	376	27
17	Nigeria	26	137	26
18	France	19	190	23
19	Belgium	7	301	18
20	United Arab Emirates	20	198	17

^aTLS: total link strength.