Evolution of evidence in spinal surgery – past, present and future Scientometric analysis of randomized controlled trials in spinal surgery

Table 4 Co-country collaboration network map in spinal surgery

Rank	Country	Publications	Percent	Degree	Burst	Half-life
1	United States	263	37.8	15	5.11	16.5
2	China	71	10.2	5	-	8.5
3	Germany	59	8.5	9	4.18	13.5
4	South Korea	36	5.2	1	-	5.5
5	Sweden	35	5	10	4.71	14.5
6	England	27	3.9	12	5.72	7.5
7	Netherlands	23	3.3	4	-	8.5
8	Canada	20	2.9	5	-	5.5
9	Japan	15	2.2	0	-	2.5
10	Denmark	13	1.9	7	-	9.5