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| | NTD Laboratories, Inc. | Publications |
 | | Hallahan TW, Krantz DA, Tului L, Alberti E, Buchanan PD, Orlandi F, Klein V, Larsen JW, Macri JN (1998) Comparison of Urinary Free Beta (hCG) and Beta-Core (hCG) in Prenatal Screening for Chromosomal Abnormalities. |
 | | Tului, L., Brambati, B., Krantz, D.A., Hallahan, T.W., and Macri, J.N. (1996) Effect of Maternal Weight and Smoking on First-Trimester Down Syndrome Screening with Maternal Serum free-Beta/PAPP-A. Am. |
 | | B., Tului, L., Orlandi, F., Damiani, G., Krantz D.A., Hallahan, T.W., and Macri, J.N. (1996) First-Trimester Down Syndrome Screening with Free Beta and PAPP-A: Observations in Multiple Pregnancies. |
| www.ntdlabs.com /publications.php (1447 words) |
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