Table 1.
Summary of included studies
| First author | Year | country | Study period | Study type | No. of patients | No. of TH | No. of TA | Quality |
|---|---|---|---|---|---|---|---|---|
| Graham | 1998 | UK | 1985-1997 | Retrospective | 153 | 32 | 119 | 7 |
| Guan GX | 2011 | China | 1990-2004 | Retrospective | 251 | 123 | 128 | 6 |
| Omloo | 2007 | Netherlands | 1994-2000 | RCT | 220 | 114 | 106 | - |
| Hulscher | 2002 | Netherlands | 1994-2000 | RCT | 220 | 114 | 106 | - |
| Zhou JZ | 2014 | China | 2007-2012 | Retrospective | 334 | 140 | 194 | 7 |
| J. Wayman | 1999 | UK | 1991-1995 | prospective | 40 | 20 | 20 | 6 |
| Kikuo Koufuji | 2005 | Japan | 1991-2000 | Retrospective | 49 | 24 | 25 | 6 |
| Zhang XY | 2014 | China | 2007-2012 | Retrospective | 135 | 57 | 78 | 6 |
| Zhu ZJ | 2006 | China | 2001-2005 | Retrospective | 273 | 175 | 98 | 5 |
| Mitsuru Sasako | 2006 | Japan | 1995-2003 | RCT | 167 | 85 | 82 | - |
| Qin YS | 2012 | China | 2000-2006 | Retrospective | 185 | 133 | 52 | 7 |
| Wu ZY | 2005 | China | 1994-2004 | Retrospective | 351 | 250 | 101 | 5 |
| Zheng B | 2010 | China | 1994-2003 | Retrospective | 331 | 284 | 47 | 7 |