. Author manuscript; available in PMC: 2017 Mar 30.
Published in final edited form as: Public Health Rev. 2014;35(2):https://web-beta.archive.org/web/20150206061220/http://www.publichealthreviews.eu/upload/pdf_files/14/00_Schulte_Hser.pdf. doi: 10.1007/BF03391702