Human chorionic gonadotropin-induced ovarian hyperstimulation syndrome is associated with up-regulation of vascular endothelial growth factor. - Wang,T.H.; Horng,S.G.; Chang,C.L.; Wu,H.M.; Tsai,Y.J.; Wang,H.S.; Soong,Y.K. (J Clin Endocrinol Metab, 2002)