column
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1999, 20(4): 241-246.
1999, 20(4): 252-257.
1999, 20(4): 265-272.
1999, 20(4): 273-277.
1999, 20(4): 278-283.
1999, 20(4): 288-293.
1999, 20(4): 294-300.
1999, 20(4): 318-320.