Study characteristics and population are shown in Table 1. Data from birth registries were extractable for in utero death. Of the co-twin but not for neurological abnormality or preterm delivery. Quality of studies summarised in Figure 2 showed. That data collection was retrospective in all studies; chorionicity and gestational age of single-twin death was reported. In 82% (23 / 28) and 64% (18 / 28), of studies respectively; and presence or absence of twin - twin, transfusion syndrome discordant. Congenital anomalies and concurrent maternal illness was reported in 46% (13 / 28), 54% (15 / 28) and 33% (9 / 28), of studies. Respectively.
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