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Publisher
- public library of science41
- elsevier bv27
- elsevier b.v.24
- oxford university press / usa20
- elsevier15
- ifo institute for economic research13
- munchen: ifo institut - leibniz-institut fur wirtschaftsforschung an der universitat munchen13
- springer science and business media llc13
- emh swiss medical publishers, ltd.12