Additional file 1.

Comparison of models for goodness-of-fit. In this additional file we describe the tests we conducted to investigate which regression model provides the best fit for the empirical publication data on childhood immunization research volume from Africa, including probability distributions and Bayesian Information Criterion.

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Wiysonge et al. BMC Medicine 2013 11:66   doi:10.1186/1741-7015-11-66