The long-term effects of oral and transdermal postmenopausal hormone replacement therapy on nitric oxide, endothelin-1, prostacyclin, and thromboxane. - Ylikorkala,O.; Cacciatore,B.; Paakari,I.; Tikkanen,M.J.; Viinikka,L.; Toivonen,J. (Fertil Steril, 1998)