In vitro fertilization twins: acceptable when desired, or iatrogenic complication preventable through elective single embryo transfer?

In vitro fertilization twins: acceptable when desired, or iatrogenic complication preventable through elective single embryo transfer?
An obstetrician recently shared her emotionally draining experience managing live delivery of in vitro fertilization (IVF) twins at 20 weeks gestation (1). Over my 35 years in IVF I have heard of many pre-viable losses of IVF twins. Her wrenching account should be required reading for any IVF provider who allows transfer of two embryos outside of Society for Assisted Reproductive Technology (SART) guidelines.
Source: fertstert.org