The selection of data sources for use in modelling studies.

Economic analysis has become increasingly important in healthcare in general, and particularly with respect to pharmaceuticals. Therefore, it is vital that the methods used in such evaluations are carefully scrutinised and refined. However, guidelines contain only a limited number of recommendations for the use of secondary data in modelling studies. In this manuscript, the selection of data sources in modelling studies will be addressed. The objectives of this manuscript are as follows: (i) to present a general strategy on how to determine the appropriateness of a data source for a model; and (ii) to present recommendations on a transparent reporting format for the selection of data sources.