chapter 1 Assisted reproductive technologies: current achievements and challenges for the future / chapter 2 Epidemiology of multiple pregnancy including natural versus iatrogenic multiple pregnancy / chapter 3 Obsteric risks and neonatal complications of twin pregnancy and higher-order multiple pregnacy -- chapter 4 Prevention of multiple pregnancies after non-in vitro fertilization treatment / chapter 5 Patient selection for single-embryo transfer / chapter 6 Embryo selection for elective single-embryo transfer / chapter 7 Impact of elective single-embryo transfer on the total and multiple pregnancy rate / chapter rm injection. -- chapter 9 National experience with elective single-embryo transfer -- chapter 10 Laboratory-related risks in assisted reproductive technologies / chapter 11 Timing of embryo transfer as relevant to twin prevention / chapter 12 Epidemiology and pathophysiology of ovarian hyperstimulation syndrome / chapter 13 Clinical management and therapy of ovarian hyperstimulation syndrome / chapter 14 Ovarian hyperstimulation syndrome: prevention in IVF and non- IVF treatment -- chapter 15 Health-economic considerations regarding single- versus double- embryo transfer -- chapter 16 Oncogenic risks related to assisted reproductive technolgies -- chapter 17 Genetic considerations regarding azoospermic and severely oligozoospermic men -- chapter 18 Preimplantation genetic diagnosis: risks and complications / chapter 20 Congenital anomalies after in vitro fertilization/intracytoplasmic sperm injection -- chapter 21 Miscellaneous risks and complications -- chapter 22 Psycholgical complications of assisted reproductive technologies -- chapter 23 Philosophical and ethical considerations regarding assisted reproductive technologies