C-peptide immunoreactivity index is associated with improvement of HbA1c: 2-Year follow-up of sitagliptin use in patients with type 2 diabetes

Takeshi Nishimura, Shu Meguro, Risa Sekioka, Karin Tanaka, Yoshifumi Saisho, Junichiro Irie, Masami Tanaka, Toshihide Kawai, Hiroshi Itoh