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Yan, Zhen; Lambert, Nathalie C; Ostensen, Monika; Adams, Kristina M; Guthrie, Katherine A; Nelson, J Lee (2006). Prospective study of fetal DNA in serum and disease activity during pregnancy in women with inflammatory arthritis. Arthritis & rheumatism, 54(7), pp. 2069-73. Hoboken, N.J.: Wiley-Blackwell 10.1002/art.21966
