INS and diabetes mellitus: The most highly cited article in the green cluster, “Prediabetes: a high-risk state for diabetes development” (26), was published in 2012 in Lancet. The most highly cited article in the blue cluster, “Homeostasis model assessment: insulin resistance and beta-cell function from fasting plasma glucose and insulin concentrations in man” (27), was published in 1985 in Diabetologia.