Table S1. Excluded reasons of the full-text publications.

No. / Language / Excluded reason / First author / Year
[1] / English / Included subjects was subset of manuscript ref. [13](Stroombergen and Waring, 1999) / Stroombergen MC / 1996
[2] / English / Included subjects was subset of manuscript ref.[11](De Palma et al., 1998) / De Palma G / 2010
[3] / English / Same subjects with manuscript ref.[17](Deng et al., 2004) / Deng Y / 2004
[4] / English / Case-only study / Santt O / 2004
[5] / English / Case-only study / Santt O / 2006
[6] / English / Case-only study / Golbe LI / 2007
[7] / English / About GSTM1, not about GSTT1 / Tison F / 1994
[8] / Chinese / About GSTM1, not about GSTT1 / Tao E / 1998
[9] / Chinese / About GSTM1, not about GSTT1 / Tao E / 1998
[10] / English / About GSTM1, not about GSTT1 / Nicholl DJ / 1999
[11] / English / About GSTM1, not about GSTT1 / Harada S / 2001
[12] / English / About GSTM1, not about GSTT1 / Vilar R / 2007
[13] / English / About GSTM1, not about GSTT1 / Perez-Pastene C / 2007
[14] / English / About GSTP1, not about GSTT1 / Paolini M / 1999
[15] / English / About GSTP1, not about GSTT1 / Longo GS / 2013
[16] / English / About GSTZ1, not about GSTT1 / Taylor MC / 2001
[17] / English / About GSTO1, not about GSTT1 / WhitbreadAK / 2004
[18] / English / About GST-1, not about GSTT1 / Nishimura M / 2005
[19] / English / Measured glutathione S-transferase activity in the plasma, not the gene polymorphism / Migliore L / 2001
[20] / English / Review not original article / DalyAK / 1994
[21] / English / Review not original article / Ebadi M / 2000
[22] / English / Review not original article / Tan EK / 2000
[23] / English / Review not original article / Broussolle E / 2002

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