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Maintenance Efficacy of Divalproex in the Prevention of Bipolar DepressionGyulai, Laszlo; Bowden, Charles L; McElroy, Susan L; Calabrese, Joseph R; Petty, Frederick; Swann, Alan C; Chou, James C-Y; Wassef, Adel; Risch, Craig S; Hirschfeld, Robert M A; Nemeroff, Charles B; Keck, Paul E; Evans, Dwight L; Wozniak, Patricia J · Neuropsychopharmacology · 2003