Drupal-Bibcite31<style face="normal" font="default" size="100%">Bisphosphonates and risk of upper gastrointestinal cancer\textendasha case control study using the General Practice Research Database (GPRD)</style><style face="normal" font="default" size="100%">Bisphosphonates and risk of upper gastrointestinal cancer\textendasha case control study using the General Practice Research Database (GPRD)</style>