Hickson, N., Hampshire, D., Castaman, G., Eikenboom, J., Rodeghiero, F., Peake, I., Goodeve, A., "Effect of the VWF promoter (GT) n repeat and single-nucleotide polymorphism c.-2527G>A on circulating von Willebrand factor levels under normal conditions", Journal of Thrombosis and Haemostasis, 2011