Top countries in pharmacology based on impact

	Country	Papers	Citations	Citations per paper
1	Scotland	1,534	28,141	18.34
2	Switzerland	2,946	48,620	16.50
3	England	10,939	164,620	15.05
4	United States	49,415	693,026	14.02
5	Sweden	3,0	45,253	13.84
6	New Zealand	1,352	18,489	13.68
7	Canada	6,106	78,762	12.90
8	The Netherlands	3,875	48,989	12.64
9	Belgium	2,457	30,137	12.
10	France	8,133	96,662	11.89
11	Germany	12,049	138,450	11.49
12	Australia	3,672	41,597	11.33
13	Denmark	1,585	17,946	11.32
14	Austria	1,406	15,366	10.93
15	Finland	1,488	16,157	10.86
16	Italy	8,211	86,369	10.52
17	Spain	4,553	40,766	8.95
18	Japan	20,323	167,971	8.
19	Taiwan	2,928	21,124	7.21
20	Poland	2,503	15,552	6.21

The data above were extracted from the Essential Science Indicators database of Thomson Reuters. This database, currently covering the period January 1998 to June 2008, surveys only journal articles (original research reports and review articles) indexed by Thomson Reuters. Articles are assigned to a category based on the journals in which they were published and Thomson Reuters’ journal-to-category field-definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Here our ranking in pharmacology is by citations per paper – among nations that earned 15,000 or more citations during the period – to reveal weighted impact. For articles with multiple authors from different nations, each nation receives full, not fractional, citation credit. Essential Science Indicators lists nations ranked in the top 50 per cent for a field over a given period, based on total citations. In pharmacology, 88 nations are listed, meaning 176 were surveyed. Twenty-four nations collected at least 15,000 citations during the period. For more information on Thomson Reuters’ Essential Science Indicators, see http://scientific.thomsonreuters.com/products/esi.