Promoter methylation of P16, RARbeta, E-cadherin, cyclin A1 and cytoglobin in oral cancer: quantitative evaluation using pyrosequencing. - Shaw,R.J.; Liloglou,T.; Rogers,S.N.; Brown,J.S.; Vaughan,E.D.; Lowe,D.; Field,J.K.; Risk,J.M. (Br J Cancer, 2006)