Mỹ cho phép bán thiết bị ngừa chứng đau nửa đầu
Cơ quan Quản lý thực phẩm và dược phẩm Mỹ (FDA) đã cấp phép bán rộng rãi máy xung điện kích thích thần kinh qua da (TENS)...
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