Ovarian steroid regulation of vascular endothelial growth factor in the human endometrium: implications for angiogenesis during the menstrual cycle and in the pathogenesis of endometriosis. - Shifren,J.; Tseng,J.; Zaloudek,C.; Ryan,I.; Meng,Y.; Ferrara,N. (J Clin Endocrinol Metab, 1996)