column
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1999, 20(3): 161-167.
1999, 20(3): 172-177.
1999, 20(3): 189-195.
1999, 20(3): 196-200.
1999, 20(3): 230-234.
1999, 20(3): 235-238.
1999, 20(3): 239-240.