title: Definition of Health 2.0 and Medicine 2.0: a systematic review.
abstract: BACKGROUND
  During the last decade, the Internet has become increasingly popular and is now an important part of our daily life. When new "Web 2.0" technologies are used in health care, the terms "Health 2.0" or "Medicine 2.0" may be used.
  
  
  OBJECTIVE
  The objective was to identify unique definitions of Health 2.0/Medicine 2.0 and recurrent topics within the definitions.
  
  
  METHODS
  A systematic literature review of electronic databases (PubMed, Scopus, CINAHL) and gray literature on the Internet using the search engines Google, Bing, and Yahoo was performed to find unique definitions of Health 2.0/Medicine 2.0. We assessed all literature, extracted unique definitions, and selected recurrent topics by using the constant comparison method.
  
  
  RESULTS
  We found a total of 1937 articles, 533 in scientific databases and 1404 in the gray literature. We selected 46 unique definitions for further analysis and identified 7 main topics.
  
  
  CONCLUSIONS
  Health 2.0/Medicine 2.0 are still developing areas. Many articles concerning this subject were found, primarily on the Internet. However, there is still no general consensus regarding the definition of Health 2.0/Medicine 2.0. We hope that this study will contribute to building the concept of Health 2.0/Medicine 2.0 and facilitate discussion and further research.
authors.affiliation: Regional Emergency Healthcare Network, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands. tom.vandebelt@azo.nl
authors.forename: Tom H
authors.initials: TH
authors.lastname: Van De Belt
authors.forename: Lucien J L P G
authors.initials: LJ
authors.lastname: Engelen
authors.forename: Sivera A A
authors.initials: SA
authors.lastname: Berben
authors.forename: Lisette
authors.initials: L
authors.lastname: Schoonhoven
mesh_terms: D019058:Community Networks; D003256:Community Participation / Q000639:trends; D057225:Data Mining; D019992:Databases as Topic / Q000639:trends; D003695:Delivery of Health Care / Q000639:trends*; D006801:Humans; D016247:Information Storage and Retrieval; D020407:Internet / Q000639:trends; D008490:Medical Informatics / Q000379:methods* / Q000639:trends; D009862:Online Systems / Q000639:trends; D010353:Patient Education as Topic; D039781:PubMed; D057386:Search Engine; D009626:Terminology as Topic