Drupal-Bibcite0<style face="normal" font="default" size="100%">Comparative, cross-sectional study of the format, content and timing of medication safety letters issued in Canada, the USA and the UK.</style><style face="normal" font="default" size="100%">Comparative, cross-sectional study of the format, content and timing of medication safety letters issued in Canada, the USA and the UK.</style>