Table 1.

Most prolific countries/regions ranked by number of publications.

Rank	Country	Publication	Citation	Average Citation/Publication
1	USA	711	9783	13.76
2	Peoples R China	337	4708	13.97
3	India	230	4245	18.46
4	England	190	2954	15.55
5	Italy	179	4047	22.61
6	Canada	148	3787	25.59
7	Australia	127	2511	19.77
8	Saudi Arabia	107	1263	11.8
9	Turkey	98	1961	20.01
10	Pakistan	85	648	7.62