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The surface EMG signal of the diaphragm was detected using a pair of Ag/AgCl electrodes (Kendall™ 100 Foam Electrodes, Conductive Adhesive Hydrogel 31118733, Mansfield, MA, USA), which were placed at an inter-electrode distance of 2 cm in the 7th or 8th intercostal spaces on the right side of the body between the mid-clavicular line and the anterior axillary line.
