TY - JOUR AN - 31 AU - Tiitinen,A. AU - Gissle,M. TI - Effect of in vitro fertilization practices on multiple pregnancy rates in Finland. JO - Fertil Steril PY - 2004 VL - 82 SP - 1689-1690 M2 - 1689 DO - 10.1016/j.fertnstert.2004.05.090 ER -