Figure 2.

Evolutionary aspects A General search: Evolution of the average number of authors per published item B General search: Evolution of the average number of cited references C Public health search: Evolution of the average number of authors per published item D Public health search: Evolution of the average number of cited references.

Groneberg-Kloft et al. BMC Public Health 2013 13:541   doi:10.1186/1471-2458-13-541
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