Study for the Efficacy Assessment of the Standard Diabetes Manual

INTERVENTION: 1 The participating clinical practitioners will be randomized to either "Manual group" or "Guide group". 2 "Diabetes Treatment Guide 2012‐2013", published by the Japan Diabetes Society will be provided to the "control group". Both "Diabetes Treatment Guide 2012‐2013" and "the Standard Diabetes Manual" published by National Center for Global Health and Meidicine be provided to the "Manual group" CONDITION: diabetes mellitus PRIMARY OUTCOME: Proportion of the following test performance:; 1. Evaluation of retinopathy by an ophthalmologist (once a year); 2. Measurement of urinary albumin excretion (every 6 months); 3. Measurement of serum creatinine level (every 6 months) INCLUSION CRITERIA: Those who satisfies all the following conditions: 1 Type 2 diabetes mellitus 2 Age between 20 and 75 years 3 Under care by the primary physician for more than 1 year