| 2005 | 2006 | 2007 | 2008 | 2009 | 2011 | 2012 |
---|---|---|---|---|---|---|---|
Records identified through database searching | 2040 | 2142 | 2795 | 3595 | 3706 | 6072 | 5874 |
Duplicated papers | 3 | 6 | 6 | 22 | 80 | 24 | 83 |
Reviews | 347 | 387 | 609 | 773 | 717 | 1176 | 1255 |
Experience | 148 | 146 | 209 | 242 | 275 | 785 | 530 |
Literature analysis | 30 | 36 | 26 | 39 | 59 | 93 | 72 |
Animal experiments | 22 | 20 | 17 | 20 | 18 | 15 | 12 |
Not randomized | 512 | 540 | 648 | 679 | 772 | 1083 | 1076 |
Retrospective study | 3 | 13 | 16 | 25 | 17 | 23 | 86 |
Case report | 20 | 38 | 47 | 80 | 77 | 189 | 156 |
Others | 244 | 257 | 548 | 704 | 648 | 1342 | 1085 |
Full-text articles assessed for eligibility | 711 | 699 | 669 | 1011 | 1043 | 1342 | 1519 |
Studies included in final review | 711 | 699 | 669 | 1011 | 1043 | 1342 | 1519 |