<http://webisa.webdatacommons.org/133019134>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<carolinashealthcare.org> .
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<http://webisa.webdatacommons.org/prov/158971108>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/133019134> .
<http://webisa.webdatacommons.org/133019134>	<http://www.w3.org/ns/prov#value>	"Doppler ultrasound records sound waves reflecting off moving objects, such as blood, to measure their speed and other aspects of how they flow.There are different types of duplex ultrasound exams." .