Drupal-Bibcite31<style face="normal" font="default" size="100%">Methodological challenges when evaluating potential off-label prescribing of drugs using electronic health care databases: A case study of dabigatran etexilate in Europe</style><style face="normal" font="default" size="100%">Methodological challenges when evaluating potential off-label prescribing of drugs using electronic health care databases: A case study of dabigatran etexilate in Europe</style>