Drupal-Bibcite0<style face="normal" font="default" size="100%">Effectiveness and safety of basal insulin therapy in type 2 diabetes mellitus patients with or without metformin observed in a national cohort in China</style><style face="normal" font="default" size="100%">Effectiveness and safety of basal insulin therapy in type 2 diabetes mellitus patients with or without metformin observed in a national cohort in China</style>