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Postprandial serum C-peptide value is the optimal index to identify patients with non-obese type 2 diabetes who require multiple daily insulin injection: analysis of C-peptide values before and after short-term intensive insulin therapy. J Diabetes Investig 4: 618-625, 2013."},{"key":"8","unstructured":"8. Asano T, Kawamura M, Watanabe T, et al. Indices of urinary and serum C-peptide corrected with fasting plasma glucose for decision-making of insulin therapy in type 2 diabetes-validation and comparison. J Jpn Diab Soc 51: 759-763, 2008 (in Japanese, Abstract in English)."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Funakoshi S, Fujimoto S, Hamasaki A, et al. Utility of indices using C-peptide levels for indication of insulin therapy to achieve good glycemic control in Japanese patients with type 2 diabetes. J Diabetes Investig 2: 297-303, 2011.","DOI":"10.1111\/j.2040-1124.2010.00096.x"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. 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