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Quality assessment of included studies
| Study | Period | Jadad’s quality scores |
|---|---|---|
| Cufer, 2006 | October 2003-June 2004 | 3 |
| Li, 2010 | Not reported | 3 |
| Liu,2012 | January 2007 - August 2011 | 3 |
| Kim, 2008 | March 2004 - February 2006 | 2 |
| Xiong, 2008 | May 2004 - February 2006 | 2 |
| Zhong, 2009 | April 2002 - June 2006 | 3 |
| Lee, 2010 | September 2005-September 2006 | 2 |
| Morere, 2010 | December 2004-June 2007 | 2 |
| Zhang, 2009 | October 2006 - December 2007 | 1 |
| Maruyama, 2008 | September 2003-January 2006 | 2 |
