Note: Sum of papers exceeds the number of total papers because of some papers have multiple country affiliations.
1. United States -- 606 papers
2. China -- 169 papers
3. United Kingdom -- 152 papers
4. Germany -- 129 papers
5. Canada -- 109 papers
6. Korea, Republic of -- 102 papers
7. Australia -- 64 papers
8. Netherlands -- 55 papers
9. Japan -- 55 papers
10. Denmark -- 43 papers
11. Sweden -- 40 papers
12. Switzerland -- 37 papers
13. Singapore -- 34 papers
14. France -- 31 papers
15. Hong Kong -- 28 papers
16. Finland -- 27 papers
17. Austria -- 24 papers
18. India -- 15 papers
19. New Zealand -- 14 papers
20. Italy -- 13 papers
21. Taiwan -- 12 papers
22. Portugal -- 10 papers
23. Spain -- 9 papers
24. Israel -- 9 papers
25. Norway -- 8 papers
26. Belgium -- 7 papers
27. Brazil -- 5 papers
28. Turkey -- 4 papers
29. Kenya -- 4 papers
30. Ireland -- 4 papers
31. Romania -- 3 papers
32. Pakistan -- 3 papers
33. Mexico -- 3 papers
34. Egypt -- 3 papers
35. Cyprus -- 3 papers
36. Malaysia -- 2 papers
37. Ecuador -- 2 papers
38. Nigeria -- 2 papers
39. Saudi Arabia -- 2 papers
40. Luxembourg -- 2 papers
41. Qatar -- 2 papers
42. Thailand -- 2 papers
43. Sri Lanka -- 1 papers
44. Cote D'ivoire -- 1 papers
45. Saint Kitts and Nevis -- 1 papers
46. Chile -- 1 papers
47. Viet Nam -- 1 papers
48. Czech Republic -- 1 papers
49. Russian Federation -- 1 papers
50. Argentina -- 1 papers
51. Slovenia -- 1 papers
52. Iceland -- 1 papers
53. Bangladesh -- 1 papers
54. Indonesia -- 1 papers