Table 1. Number of original research articles with authors given equal credit and annual prevalence.

Year	Ane	BJA	A&A	Total
2002	4/429(0.9%)	0/261(0)	2/664(0.3%)	6/1,354(0.4%)
2003	0/382(0)	1/259(0.4%)	1/640(0.2%)	2/1,281(0.2%)
2004	7/382(1.8%)	1/252(0.4%)	3/629(0.5%)	11/1,263(0.9%)
2005	11/300(3.7%)	6/257(2.3%)	1/645(0.2%)	18/1,202(1.5%)
2006	15/291(5.2%)	1/243(0.4%)	3/553(0.5%)	19/1,087(1.7%)
2007	13/281(5.5%)	5/235(2.1%)	9/515(1.7%)	27/987(2.7%)
2008	9/268(3.8%)	6/233(2.6%)	10/526(1.9%)	25/997(2.5%)
2009	15/240(5.3%)	8/224(3.6%)	16/530(3.0%)	39/1,035(3.8%)
2010	11/238(4.1%)	10/219(4.6%)	10/416(2.4%)	31/903(3.5%)
2011	21/237(8.8%)	21/238(8.8%)	12/358(3.4%)	54/836(6.4%)
Total	106/3,048(3.5%)	59/2,421(2.4%)	67/5,476(1.2%)	232/10,945(2.1%)
Trend	P<0.001	P<0.001	P<0.001	P<0.001

Ane, Anesthesiology; BJA, British Journal of Anaesthesia; A&A, Anesthesia & Analgesia.