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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	Source Reference: Hecht HS, et al Secondhand tobacco smoke in never smokers is a significant risk factor for coronary artery calcification J Am Coll Cardiol Cardiovas Img 2013; DOI: 10.1016/j.jcmg.2013.02.004.
http://www.w3.org/ns/prov#wasQuotedFrom	medpagetoday.com