preferred_name: Twin birth, unspecified whether mate liveborn or stillborn, born in hospital, delivered without mention of cesarean section
preferred_name_lc: twin birth, unspecified whether mate liveborn or stillborn, born in hospital, delivered without mention of cesarean section
label: Twin, unspecified, born in hospital, delivered without mention of cesarean section
label_lc: twin, unspecified, born in hospital, delivered without mention of cesarean section