Table 1.
Characteristics of the included studies
| Study | Year | Country | Ethnicity | Sample size | Genotype method |
|---|---|---|---|---|---|
| Baldani et al. | 2014 | Croatia | Caucasians | 151/179 | TaqMan |
| Yang et al. | 2013 | China | Asians | 120/118 | RFLP |
| Shaikh et al. | 2013 | Indian | Asians | 450/300 | Direct sequencing |
| Hemimi et al. | 2013 | USA | Caucasians | 50/96 | RFLP |
| Dasgupta et al. | 2012 | Indian | Asians | 250/299 | PCR |
| Bidzińska-Speichert et al. | 2011 | Poland | Caucasians | 54/51 | RFLP |
| Christopoulos et al. | 2010 | Greece | Caucasians | 183/148 | RFLP |
| San-Millán et al. | 2010 | Spain | Caucasians | 161/113 | RFLP |
| Chae et al. | 2009 | Korea | Asians | 184/256 | RT-PCR |
| Xita et al. | 2009 | Greece | Caucasians | 180/140 | RFLP |
| Gu et al. | 2009 | Korea | Asians | 238/125 | RFLP |
| Koika et al. | 2009 | Greece | Caucasians | 156/56 | RFLP |
| Zheng et al. | 2008 | China | Asians | 150/135 | RFLP |
| Knebel et al. | 2008 | German | Caucasians | 21/120 | RFLP |
| Antoine et al. | 2007 | USA | Caucasians | 285/187 | TaqMan |
| Guzman et al. | 2007 | Chile | Caucasians | 50/75 | RFLP |
| Yilmaz et al. | 2006 | Turkey | Caucasians | 100/100 | RFLP |
| Wang et al. | 2006 | China | Asians | 201/147 | RFLP |
| Haap et al. | 2005 | German | Caucasians | 57/567 | PCR |
| Hahn et al. | 2005 | German | Caucasians | 102/104 | RFLP |
| Tok et al. | 2005 | Turkey | Caucasians | 60/60 | PCR |
| Oroi et al. | 2004 | Italy | Caucasians | 120/120 | RFLP |
| Korhonen et al. | 2003 | Finland | Caucasians | 135/115 | SSCP |
RT-PCR: real-time PCR; RFLP: restriction fragment length polymorphism; SSCP: single strand conformation polymorphism.