<http://webisa.webdatacommons.org/421889849>	<http://www.w3.org/ns/prov#value>	"Environmental factors such as stress and fatigue seem to make tics worse in many patients, indicating a psychological link to the problem." .
<http://webisa.webdatacommons.org/prov/273568341>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/421889849> .
<http://webisa.webdatacommons.org/421889849>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/421889849>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<wisegeek.com> .
<http://webisa.webdatacommons.org/prov/398567007>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/421889849> .