Additional file 1.

Number of published items for every organ over 5 time periods. In this file a Scopus – data research was performed for every organ. The research included the periods between 1961–1970, 1971–1980, 1981–1990, 1991–2000, and 2001–2007 (decade 2000–2010 not finalized).

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Groneberg-Kloft et al. Health Research Policy and Systems 2008 6:6   doi:10.1186/1478-4505-6-6