TY - STAND AU - A. Walker BT - Pharmacoepidemiol Drug Saf DO - 10.1002/pds.2249 M1 - 11 PY - 2011 SP - 1159 EP - 67 T2 - Pharmacoepidemiol Drug Saf TI - Identification of esophageal cancer in the General Practice Research Database VL - 20 SN - 1053-8569 ER -