Table 2. Top 10 countries with collaborated with the United States.

Country	Average Citations	Total # of Publications	% Total
Germany	22.89	138	16.0
Japan	23.17	113	13.1
UK	21.07	105	12.2
Canada	18.40	101	11.7
China	9.99	100	11.6
Italy	17.76	71	8.26
France	17.50	48	5.58
South Korea	10.77	47	5.47
Netherlands	22.32	41	4.77
Spain	26.41	39	4.53
Remaining 42 Countries	11.90	344	40.0