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Illustration of the causal inference scheme.
Illustration of the causal inference scheme. (A) Index date is the first prescription of diabetes second-line drug after use of metformin. (B) Potential censoring events include switching to another second-line drug, missing glycated hemoglobin (HbA1c) or body mass index (BMI) measurement, or undergoing bariatric surgery. (C) Outcomes (HbA1c and BMI) are checked after 6 and 12 months from index date. (D) Follow-up ends after 15 months. Assaf Gottlieb et al. BMJ Open Diab Res Care 2017;5:e000435 ©2017 by American Diabetes Association
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