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| Study | Reason for exclusion |
|---|---|
| Graham 2005 | Participants in this study had gestational diabetes |
| Wainstein 2011 | The study used a combination preparation (i.e. cinnamon, zinc gluconate and tricalcium phosphate) |
| Ziegenfuss 2006 | In accordance with ADA and WHO criteria, participants in this study did not have diabetes mellitus (FBGL < 7 mmol/L) |
ADA: American Diabetes Association; FBGL: fasting blood glucose level; WHO: World Health Organization.
