About: http://webisa.webdatacommons.org/432260779

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	Smoking is the most important risk factor of COPD.A total of 22 studies were analysed.
http://www.w3.org/ns/prov#wasQuotedFrom	pubmedcentralcanada.ca