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Management of twin pregnancies with fetal trisomies.
Sebire NJ, Snijders RJM, Santiago C, Papapanagiotou G, Nicolaides KH.
BJOG 1997;104:220-2. -
Maternal serum free beta-hCG at 10 to 14 weeks of gestation in trisomic twin pregnancies.
Noble PL, Snijders RJ, Abraha HD, Sherwood RA, Nicolaides KH.
BJOG 1997;104:741-3.