TY - JOUR AU - Klonoff-Cohen, H S; Natarajan, L TI - The effect of advancing paternal age on pregnancy and live birth rates in couples undergoing in vitro fertilization or gamete intrafallopian transfer JO - Am J Obstet Gynecol IS - 02 VL - 191 PY - 2004 DO - 10.1016/j.ajog.2004.01.035 SP - 507 EP - 514 ER -