Table 3.

Top 15 most prolific countries in the field of OVT-CNSTs.

Ranking	Countries	Publications, n	% of 473	H-index	TC	AC
1	USA	307	64.90	57	11113	36.2
2	Germany	55	11.63	22	1493	27.15
3	Canada	38	8.03	23	1737	45.71
4	China	37	7.82	13	632	17.08
5	Spain	26	5.50	12	550	21.15
6	Netherlands	25	5.29	14	732	29.28
7	Japan	22	4.65	14	841	38.23
8	UK	14	2.96	10	548	39.14
9	Italy	14	2.96	8	177	12.64
10	France	13	2.75	8	260	20
11	Russia	13	2.75	4	72	5.65
12	Switzerland	9	1.90	7	141	15.67
13	Austria	7	1.48	6	225	32.14
14	Finland	7	1.48	7	317	45.29
15	Sweden	6	1.27	5	151	25.17

Ranking: according to the number of total publications; TC, Total citations; AC, Average citations per item.