A snapshot of pneumonia research activity and collaboration patterns (2001–2015): a global bibliometric analysis

Table 1 Top 15 countries ranked by total number of publications by quinquenniums 2001–2005, 2006–2010, and 2010–2015

Total				2001–2005			2006–2010			2011–2015
Country	N of docs	%	^a PPD	Country	N of docs	%	Country	N of docs	%	Country	N of docs	%
USA	8735	38.49	−4.61	USA	2248	41.13	USA	2907	39.14	USA	3580	36.52
UK	1629	7.18	0.81	France	417	7.63	Germany	521	7.01	China	827	8.44
Japan	1581	6.97	0.03	UK	403	7.37	Japan	518	6.97	Japan	725	7.40
Germany	1544	6.80	0.18	Germany	388	7.10	UK	512	6.89	UK	714	7.28
France	1527	6.73	0.30	Japan	338	6.18	France	498	6.71	Germany	635	6.48
Spain	1251	5.51	0.81	Spain	297	5.43	Spain	423	5.70	France	612	6.24
China	1126	4.96	0.11	Canada	290	5.31	Canada	361	4.86	Spain	531	5.42
Canada	1091	4.81	0.74	Netherlands	205	3.75	Italy	298	4.01	Canada	440	4.49
Netherlands	911	4.01	1.43	Italy	160	2.93	Netherlands	279	3.76	Netherlands	427	4.36
Italy	859	3.79	1.35	Australia	150	2.74	China	237	3.19	Italy	401	4.09
Australia	734	3.23	1.32	Switzerland	128	2.34	Australia	225	3.03	Australia	359	3.66
Brazil	600	2.64	1.62	Belgium	87	1.59	Brazil	213	2.87	South Korea	315	3.21
Switzerland	541	2.38	1.65	Sweden	84	1.54	Switzerland	190	2.56	Brazil	313	3.19
South Korea	534	2.35	1.5	Denmark	83	1.52	Taiwan	149	2.01	Taiwan	296	3.02
Taiwan	509	2.24	0.76	Turkey	83	1.52	South Korea	148	1.99	Switzerland	223	2.28

ISSN: 1471-2288