Sheu 2015.

Methods	Randomised double‐blind trial
Participants	Asian participants with type 2 diabetes mellitus inadequately controlled by basal insulin with/without oral agents
Interventions	Treatment with linagliptin 5 mg once daily or placebo. Basal insulin dose remained stable for 24 weeks, after which adjustments could be made according to the investigator's discretion to improve glycaemic control
Outcomes	HbA1c, adverse events
Notes	Need to determine if subgroup analysis with insulin monotherapy is possible