Fig. 1

Study device and location for applying pads. a Actual photo of the AT-04. The appearance of the test device (AT-04) and the sham device (S-02) is identical, and it is impossible to distinguish the two based on their external features. b Location for applying pads. Participants will attach the pads themselves to both sides of their lower abdomens. The grey circle indicates the basic location for applying the pads