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3.

Social stress predicts preterm birth in twin pregnancies
by Owen, David J.

Journal of psychosomatic obstetrics and gynaecology, 2017, Vol.38 (1), p.63-72

6.

Fetal nuchal translicency test for Down's syndrome
by Neilson, James P

The Lancet (British edition), 1997, Vol.350 (9091), p.1631-1632

17.

From Field and Study
by Leach, Frank A.

The Condor (Los Angeles, Calif.), 1925, Vol.27 (2), p.69-78

18.

From Field and Study
by Holman, F. C.

The Condor (Los Angeles, Calif.), 1926, Vol.28 (2), p.92-102

1

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