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Am J Obstet Gynecol. 2000 Apr;182(4):931-7. doi: 10.1016/s0002-9378(00)70349-8.
Nausea and vomiting during pregnancy: A prospective study of its frequency, intensity, and patterns of change.
Lacroix R, Eason E, Melzack R
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Am J Obstet Gynecol. 2000 Apr;182(4):931-7. doi: 10.1016/s0002-9378(00)70349-8.
Lacroix R, Eason E, Melzack R