About: http://webisa.webdatacommons.org/428555625

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, the high cost and inconvenience of polysomnography, requiring multiple electrodes attached to the face, head, and other parts of the body, make it less practical for research studies.
http://www.w3.org/ns/prov#wasQuotedFrom	clinicaltrials.gov