[11] Phuong T D, Chuong P V, Khiem D T, et al. The Analyst, 1999, 124: 553.
[17] Power M L, Heaney R P, Kalkwarf H J, et al. Am J. Obstetrics and Gynecology, 1999, 181(6): 1560.
[11] Phuong T D, Chuong P V, Khiem D T, et al. The Analyst, 1999, 124: 553.
[17] Power M L, Heaney R P, Kalkwarf H J, et al. Am J. Obstetrics and Gynecology, 1999, 181(6): 1560.
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