column
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1998, 19(6): 422-428.
1998, 19(6): 434-438.
1998, 19(6): 446-452.
1998, 19(6): 458-462.
1998, 19(6): 463-467.
1998, 19(6): 468-472.
1998, 19(6): 482-488.
1998, 19(6): 489-492.
1998, 19(6): 493-494.