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  Indian J Med Microbiol
 

Figure 1: The time interval between the two vertical red lines was described as the time interval between the R-wave in the electrocardiogram and the corresponding peak late systolic pulmonary vein flow velocity

Figure 1: The time interval between the two vertical red lines was described as the time interval between the R-wave in the electrocardiogram and the corresponding peak late systolic pulmonary vein flow velocity