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VSD results. (A–D): the −120 mmHg group, −180 mmHg group, −240 mmHg group and control group on the third day; (E–H): the −120 mmHg group, −180 mmHg group, −240 mmHg group and control group on the 16th day; (I–L): the −120 mmHg group, −180 mmHg group, −240 mmHg group and control group on the 30th day.
