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Wikipedia
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Citizendium
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Scholarpedia
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Encyclopedia of Earth
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Atmospheric Chemistry and Physics
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PLoS ONE
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Scope of site
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All human knowledge
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All human knowledge
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Starting out with a few core areas but potentially all scholarly knowledge
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Earth sciences
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Atmospheric Chemistry and Physics
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Starting out with biomedicine but potentially all scholarly knowledge
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Original research
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No
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Possibly
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No
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No
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Only
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Only
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License
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CC-BY-SA
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CC-BY-SA
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mostly © but also CC-BY-NC-ND and GFDL
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CC-BY-SA
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CC-BY
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CC-BY
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Review model
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Public; post publication
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Public; post publication
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Public; post publication
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Non-public; pre publication
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Public; post technical, pre formal publication[2]
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Non-public; pre publication
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Anonymity of authors
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Default; site-wide
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No; site-wide
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No for primary authors, yes for other contributors; per article
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No
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No
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No
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Anonymity of reviewers
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Default; site-wide
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No; site-wide
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Possible; per article
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No
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Possible; per comment
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Yes
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Minimal qualification to submit an article for review
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None
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Login
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Invitation or community election, based on specialist expertise
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Login
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None
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None
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Minimal qualification to review
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None
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Generalist expertise (typically PhD) in the field
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Invitation based on specialist expertise
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Invitation based on specialist expertise
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Invitation based on specialist expertise
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Invitation based on specialist expertise
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Minimal qualification to modify content before review
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None
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Login
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Login
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Login
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None
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None
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Minimal qualification to modify reviewed content
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None
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Generalist expertise (typically PhD) in the field
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Approval by curator (typically a well-known expert in the field)
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Generalist expertise (typically PhD) in the field
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N.A.
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N.A. for PDF version; None for annotations
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Minimal qualification to comment on reviewed content
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None
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Login
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Login
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Login
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Login
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Login
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Metrics at site/ article/ contributor level
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Built in but outsourced to reduce server load
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Built in
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Built in; see also the site-specific Scholar Index as well as Wikigenes
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Built in
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Yes (IF)/ Not public / No
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Yes (IF)/ Public / No
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