0000354204-00-000062 SC 13G 1 20000203 ADVANCED NEUROMODULATION SYSTEMS INC 0000351721 3841 751646002 TX 1231 SC 13G 34 005-33902 520811 ONE ALLENTOWN PARKWAY ALLEN TX 75002 9723909800 ONE ALLENTOWN PARKWAY ALLEN TX 75002 QUEST MEDICAL INC 19920703 DIMENSIONAL FUND ADVISORS INC 0000354204 0000 22370029 IL 1231 SC 13G 1299 OCEAN AVE 11TH FLOOR SANTA MONICA CA 90401 3103958005 1299 OCEAN AVENUE 11TH FLOOR SANTA MONICA CA 90401 SC 13G 1 000035420400000062-001-seq1-sc-13g.txt 1998 SCHEDULE 13G - ADVANCED NEUROMODULA