Erratum to: Diabetol Int DOI 10.1007/s13340-013-0155-6

In our published paper, there were two errors to be corrected as follows.

In line 11 of first paragraph in Discussion section, “bolus insulin >15 units per day” should be “bolus insulin ≥15 units per day”. The last sentence of Discussion section should be “In conclusion, add-on sitagliptin may be a new therapeutic option in patients with type 2 diabetes with inadequate glycemic control by insulin therapy, possibly using bolus insulin dose of over 15 units per day”.