Gillies, C.L., Abrams, K.R., Lambert, P.C., et al. (2007) Pharmacological and Lifestyle Interventions to Prevent or Delay Type 2 Diabetes in People with Impaired Glucose Tolerance: Systematic Review and Meta-Analysis. BMJ, 334, 299. https:/doi.org/10.1136/bmj.39063.689375.55