FIRST‐TRIMESTER BIOCHEMICAL SCREENING FOR DOWN SYNDROME WITH THE USE OF PAPP‐A, AFP, AND β‐hCG
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J. Grudzinskas | A. Ballesta | A. Borrell | E. Casals | B. Teisner | C. Comas | A. Ballesta | A. Fortuny | A. Soler | Y. Suzuki | C. Sanllehy | J. Ojuel | B. Teisner