Health Library / Online Article
July 2015
Journal of Occupational and Environmental Medicine
August 2011
Wiley Online Library
April 2019
National Library of Medicine
June 2010
Radiological Society of North America
January 2014
Springer Link
February 2007
Government Accountability Office
November 2018
National Library of Medicine
June 2013
Taylor & Francis
May 2007
ProQuest Dissertations & Theses Global