A second problem is the difficulty of comparisons across cultures.
In our work, each socioeconomic variable was subdivided into two levels to account for the difficulties of comparison linked to the level of economic development of the countries in which study sites were selected.
The table also reveals the difficulty of direct comparison of the results due to the different models, data and GPU devices.
One major difficulty of the comparison of our results with results from these studies is the definition of MetS used.
Moreover, difficulty of direct comparison of radiographic appearance with histological finding and variation in histological criteria of gastritis had made significance of the AG patterns unknown to pathologists as well as radiologists.
Whereas, these studies usually applied the CIMPs comprising various gene patterns different among studies, which might lead to the difficulty of direct comparison and could generate more heterogeneity if the data were pooled.
Such persistence would increase the difficulty of making comparisons between effects caused by radiation versus chemical agents.
The long-standing fears about such an assessment process include the danger of manipulation through collusion and the difficulty of making comparisons across programmes with a different composition of user groups [ 13].
Similar not otherwise specified levels for haematological cancers occur within SEER (Surveillance, Epidemiology, and End Results, http://seer.cancer.gov/) registries (Morton et al, 2006), where the use of a different standard population (US 2000 census) adds to the difficulty of making comparisons with European populations (Morton et al, 2006; Li et al, 2015).
This comparison highlights the difficulty of inter-species comparisons using microarray technology, a limitation that is compounded by the lack of complete genomes for both S. japonicum and S. mansoni and the absence of comprehensive bioinformatics comparisons at the genomic level.
