The past 12 years have seen a dramatic increase in the use of tDCS; there have been over ______ studies reported in the professional literature.
A) 200
B) 500
C) 1,000
D) 5,000

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The Answer of The past 12 years have seen a dramatic increase in the use of tDCS; there have been over ______ studies reported in the professional literature.
A) 200
B) 500
C) 1,000
D) 5,000

The Past 12 Years Have Seen a Dramatic Increase in the Use