<http://webisa.webdatacommons.org/prov/482909770>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/242331586> .
<http://webisa.webdatacommons.org/242331586>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<hprc-online.org> .
<http://webisa.webdatacommons.org/242331586>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/242331586>	<http://www.w3.org/ns/prov#value>	"In addition, organized studies on pregnant women are ethically complicated, so determining the effects of certain types of exercise can be difficult." .