Common polymorphic variation in the genetically diverse African insulin gene and its association with size at birth. Petry CJ, Rayco-Solon P, Fulford AJ, Stead JD, Wingate DL, Ong KK, Sirugo G, Prentice AM, Dunger DB Human genetics. Jan 2009 (DOI : 10.1007/s00439-009-0681-2)