<http://webisa.webdatacommons.org/prov/11145630>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/233581431> .
<http://webisa.webdatacommons.org/233581431>	<http://www.w3.org/ns/prov#value>	"This drop out rate is a problem common to many long term follow???up studies12 and may limit the generalisability of our findings." .
<http://webisa.webdatacommons.org/233581431>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/233581431>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<pubmedcentralcanada.ca> .