Table 4.

List of countries with a minimum contribution of 100 documents

Country	Frequencya	% N = 8619	SCP	%	MCP	%	TC	C/A	h-index
USA	2852	33.1	1499	52.6	1353	47.4	111552	39.1	145
China	1057	12.3	604	57.1	453	42.9	23153	21.9	67
Germany	608	7.1	203	33.4	405	66.6	28217	46.4	77
Hong Kong	548	6.4	326	59.5	222	40.5	26917	49.1	71
Canada	527	6.1	202	38.3	325	61.7	21809	41.4	75
France	521	6.0	170	32.6	351	67.4	18658	35.8	68
UK	470	5.5	132	28.1	338	71.9	14704	31.3	60
Japan	324	3.8	121	37.3	203	62.7	8309	25.6	48
Turkey	306	3.6	269	87.9	37	12.1	4375	14.3	30
Taiwan	285	3.3	228	80.0	57	20.0	7161	25.1	39
Singapore	255	3.0	142	55.7	113	44.3	9270	36.4	43
Netherlands	209	2.4	63	30.1	146	69.9	12989	62.1	50
Australia	195	2.3	43	22.1	152	77.9	6262	32.1	43
South Africa	160	1.9	47	29.4	113	70.6	6219	38.9	41
Switzerland	160	1.9	21	13.1	139	86.9	8659	54.1	44
Spain	150	1.7	61	40.7	89	59.3	3883	25.9	33
Saudi Arabia	142	1.6	51	35.9	91	64.1	4733	33.3	38
Italy	140	1.6	54	38.6	86	61.4	2930	20.9	29
India	123	1.4	74	60.2	49	39.8	1207	9.8	18
Belgium	109	1.3	18	16.5	91	83.5	4054	37.2	34
Sweden	104	1.2	33	31.7	71	68.3	2498	24.0	31
Iran	102	1.2	84	82.4	18	17.6	1264	12.4	19
Malaysia	100	1.2	58	58.0	42	42.0	4395	44.0	30

TC total citations, C/A citation per article, h-index Hirsch index, USA United States of America, UK United Kingdom, SCP single country publications, MCP multiple country publications

^aWhen productivity of each country was calculated alone the total number exceeds the number of retrieved articles. However, when productivity of all countries was dealt with collectively, the total number will be lesser than that presented in the table. The collaboration between countries created some percentage of overlap and therefore certain number of similar countries were counted twice for collaborating countries