Reference
1. Ong SS, Zamora J, Khan KS, Kilby MD: Prognosis for the co-twin following single-twin death: a systematic review . BJOG2006, 113 (9):992-998.
2. Mackie FL, Rigby A, Morris RK, Kilby MD: Prognosis of the co-twin following spontaneous single intrauterine fetal death in twin pregnancies: a systematic review and meta-analysis . BJOG 2019,126 (5):569-578.
3. Sampson A, de Crespigny LC: Vanishing twins: the frequency of spontaneous fetal reduction of a twin pregnancy . Ultrasound Obstet Gynecol 1992, 2 (2):107-109.
4. Landy HJ, Weiner S, Corson SL, Batzer FR, Bolognese RJ: The ”vanishing twin”: ultrasonographic assessment of fetal disappearance in the first trimester . Am J Obstet Gynecol 1986,155 (1):14-19.
5. Kelly MP, Molo MW, Maclin VM, Binor Z, Rawlins RG, Radwanska E:Human chorionic gonadotropin rise in normal and vanishing twin pregnancies . Fertil Steril 1991, 56 (2):221-224.
6. Dickey RP, Taylor SN, Lu PY, Sartor BM, Storment JM, Rye PH, Pelletier WD, Zender JL, Matulich EM: Spontaneous reduction of multiple pregnancy: incidence and effect on outcome . Am J Obstet Gynecol 2002, 186 (1):77-83.
7. Shek NW, Hillman SC, Kilby MD: Single-twin demise: pregnancy outcome . Best practice & research Clinical obstetrics & gynaecology 2014, 28 (2):249-263.
8. Hansen M, Kurinczuk JJ, Milne E, de Klerk N, Bower C:Assisted reproductive technology and birth defects: a systematic review and meta-analysis . Hum Reprod Update 2013,19 (4):330-353.
9. Yukobowich E, Anteby EY, Cohen SM, Lavy Y, Granat M, Yagel S:Risk of fetal loss in twin pregnancies undergoing second trimester amniocentesis(1) . Obstet Gynecol 2001,98 (2):231-234.
10. Vlkova B, Hodosy J: Vanishing twin as a potential source of bias in non-invasive fetal sex determination: a case report . J Obstet Gynaecol Res 2014, 40 (4):1128-1131.
11. Hochstenbach R, Elferink MG, van Zon PHA, Lichtenbelt KD, van Harssel J, Schuring-Blom H, Page-Christiaens G: Discordant NIPT result in a viable trisomy-21 pregnancy due to prolonged contribution to cfDNA by a demised trisomy-14 cotwin . Clin Case Rep 2018,6 (5):788-791.
12. Kelley JF, Henning G, Ambrose A, Adelman A: Vanished Twins and Misdiagnosed Sex: A Case Report with Implications in Prenatal Counseling Using Noninvasive Cell-Free DNA Screening . J Am Board Fam Med 2016, 29 (3):411-413.
13. Khalil A, Rodgers M, Baschat A, Bhide A, Gratacos E, Hecher K, Kilby MD, Lewi L, Nicolaides KH, Oepkes D et al : ISUOG Practice Guidelines: role of ultrasound in twin pregnancy . Ultrasound Obstet Gynecol 2016, 47 (2):247-263.
14. Lau TK, Cheung SW, Lo PS, Pursley AN, Chan MK, Jiang F, Zhang H, Wang W, Jong LF, Yuen OK et al : Non-invasive prenatal testing for fetal chromosomal abnormalities by low-coverage whole-genome sequencing of maternal plasma DNA: review of 1982 consecutive cases in a single center . Ultrasound Obstet Gynecol 2014,43 (3):254-264.
15. Xu Y, Lin Z, Tang C, Tang Y, Cai Y, Zhong H, Wang X, Zhang W, Xu C, Wang J et al : A new massively parallel nanoball sequencing platform for whole exome research . BMC bioinformatics2019, 20 (1):153.
16. Drmanac R, Sparks AB, Callow MJ, Halpern AL, Burns NL, Kermani BG, Carnevali P, Nazarenko I, Nilsen GB, Yeung G et al : Human genome sequencing using unchained base reads on self-assembling DNA nanoarrays . Science 2010, 327 (5961):78-81.
17. Huang J, Liang X, Xuan Y, Geng C, Li Y, Lu H, Qu S, Mei X, Chen H, Yu T et al : A reference human genome dataset of the BGISEQ-500 sequencer . GigaScience 2017, 6 (5):1-9.
18. Yuan Y, Chai X, Liu N, Gu B, Li S, Gao Y, Zhou L, Liu Q, Yang F, Liu J et al : FF-QuantSC: accurate quantification of fetal fraction by a neural network model . Mol Genet Genomic Med2020:e1232.
19. Jiang F, Ren J, Chen F, Zhou Y, Xie J, Dan S, Su Y, Yin B, Su W, Zhang H et al : Noninvasive Fetal Trisomy (NIFTY) test: an advanced noninvasive prenatal diagnosis methodology for fetal autosomal and sex chromosomal aneuploidies . BMC Med Genomics 2012,5 :57.
20. Cherkassky V: The nature of statistical learning theory~ . IEEE Trans Neural Netw 1997,8 (6):1564.
21. Curnow KJ, Wilkins-Haug L, Ryan A, Kirkizlar E, Stosic M, Hall MP, Sigurjonsson S, Demko Z, Rabinowitz M, Gross SJ: Detection of triploid, molar, and vanishing twin pregnancies by a single-nucleotide polymorphism-based noninvasive prenatal test . Am J Obstet Gynecol 2015, 212 (1):79 e71-79.
22. Gromminger S, Yagmur E, Erkan S, Nagy S, Schock U, Bonnet J, Smerdka P, Ehrich M, Wegner RD, Hofmann W et al : Fetal Aneuploidy Detection by Cell-Free DNA Sequencing for Multiple Pregnancies and Quality Issues with Vanishing Twins . J Clin Med 2014,3 (3):679-692.
23. Kaufman HK, Hume RF, Jr., Calhoun BC, Carlson N, Yorke V, Elliott D, Evans MI: Natural history of twin gestation complicated by in utero fetal demise: associations of chorionicity, prematurity, and maternal morbidity . Fetal Diagn Ther 2003,18 (6):442-446.
24. McPherson JA, Odibo AO, Shanks AL, Roehl KA, Macones GA, Cahill AG:Impact of chorionicity on risk and timing of intrauterine fetal demise in twin pregnancies . Am J Obstet Gynecol 2012,207 (3):190 e191-196.
25. Kilby MD, Govind A, O’Brien PM: Outcome of twin pregnancies complicated by a single intrauterine death: a comparison with viable twin pregnancies . Obstet Gynecol 1994, 84 (1):107-109.
26. Bevilacqua E, Chen K, Wang Y, Doshi J, White K, de Marchin J, Conotte S, Jani JC, Schmid M: Cell-free DNA analysis after reduction in multifetal pregnancy . Ultrasound Obstet Gynecol2020, 55 (1):132-133.
27. Boyd TK: The placenta in intrauterine demise . APMIS2018, 126 (7):621-625.
28. Genest DR: Estimating the time of death in stillborn fetuses: II. Histologic evaluation of the placenta; a study of 71 stillborns . Obstet Gynecol 1992, 80 (4):585-592.
29. Niles KM, Murji A, Chitayat D: Prolonged duration of persistent cell-free fetal DNA from vanishing twin . Ultrasound Obstet Gynecol 2018, 52 (4):547-548.
30. Wilkins-Haug L, Zhang C, Cerveira E, Ryan M, Mil-Homens A, Zhu Q, Reddi H, Lee C, Bianchi DW: Biological explanations for discordant noninvasive prenatal test results: Preliminary data and lessons learned . Prenat Diagn 2018, 38 (6):445-458.
31. Cuckle H, Benn P, Pergament E: Cell-free DNA screening for fetal aneuploidy as a clinical service . Clin Biochem 2015,48 (15):932-941.
32. Futch T, Spinosa J, Bhatt S, de Feo E, Rava RP, Sehnert AJ:Initial clinical laboratory experience in noninvasive prenatal testing for fetal aneuploidy from maternal plasma DNA samples .Prenat Diagn 2013, 33 (6):569-574.
33. Porreco RP, Garite TJ, Maurel K, Marusiak B, Obstetrix Collaborative Research N, Ehrich M, van den Boom D, Deciu C, Bombard A:Noninvasive prenatal screening for fetal trisomies 21, 18, 13 and the common sex chromosome aneuploidies from maternal blood using massively parallel genomic sequencing of DNA . Am J Obstet Gynecol 2014, 211 (4):365 e361-312.
34. Hartwig TS, Ambye L, Sorensen S, Jorgensen FS: Discordant non-invasive prenatal testing (NIPT) - a systematic review .Prenat Diagn 2017, 37 (6):527-539.
Table1 Characteristics and clinical details of pregnancies. ART, artificial reproductive technology; DCDA, dichorionic diamniotic; IVF-ET, in vitro fertilization and embryo transfer; NT, nuchal translucency.