The common pentanucleotide polymorphism of the 3′-untranslated region of the leptin receptor gene is associated with serum insulin levels and the risk of type 2 diabetes in non-diabetic men: a prospective case–control studyH.-M. Lakka; L. Oksanen; T.-P. Tuomainen; K. Kontula; J. T. Salonen · 2000