RT Journal Article SR Electronic T1 Glutathione S-transferase M1, T1 status and the risk of head and neck cancer: a meta-analysis JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 360 OP 365 DO 10.1136/jmg.2003.016246 VO 41 IS 5 A1 Z Ye A1 H Song A1 Y Guo YR 2004 UL http://jmg.bmj.com/content/41/5/360.abstract AB