TABLE 1.

Top 20 productive countries/regions related to CPDT.

Ranking	Countries	Publications, n	% Of 5,804	H-Index	Average citations per document
1	CHINA	2,145	36.96	128	35.58
2	USA	1,119	19.28	107	52.44
3	JAPAN	341	5.88	48	28.33
4	UK	332	5.72	65	49.02
5	SOUTH KOREA	316	5.44	46	31.17
6	GERMANY	246	4.24	52	37.88
7	FRANCE	221	3.81	46	34.76
8	BRAZIL	209	3.60	34	21.37
9	CANADA	184	3.17	48	61.51
10	POLAND	178	3.07	38	50.58
11	ITALY	168	2.89	40	29.4
12	NETHERLANDS	158	2.72	46	46.3
13	SINGAPORE	116	2.00	44	56.06
14	INDIA	114	1.96	26	20.08
15	SWITZERLAND	112	1.93	38	45.76
16	SPAIN	100	1.72	28	31.88
17	NORWAY	98	1.69	36	73.27
18	SOUTH AFRICA	88	1.52	21	21.6
19	RUSSIA	86	1.48	19	15.58
20	TURKEY	85	1.46	19	15.65

Ranking: according to the number of total publications.